Gravity
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F → = m a → {\displaystyle {\vec {F}}=m{\vec {a}}}
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Hammer and feather drop: astronaut David Scott (from mission Apollo 15) on the Moon enacting the legend of Galileo's gravity experiment. (1.38 MB, ogg/Theora format).
Gravity, or gravitation, is a natural phenomenon by which all things with mass are brought toward (or gravitate toward) one another, including objects ranging from atoms and photons, to planets and stars. Since energy and mass are equivalent, all forms of energy (including light) cause gravitation and are under the influence of it. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides. The gravitational attraction of the original gaseous matter present in the Universe caused it to begin coalescing, forming stars – and for the stars to group together into galaxies – so gravity is responsible for many of the large scale structures in the Universe. Gravity has an infinite range, although its effects become increasingly weaker on farther objects.
Gravity is most accurately described by the general theory of relativity (proposed by Albert Einstein in 1915) which describes gravity not as a force, but as a consequence of the curvature of spacetime caused by the uneven distribution of mass. The most extreme example of this curvature of spacetime is a black hole, from which nothing—not even light—can escape once past the black hole's event horizon.[1] However, for most applications, gravity is well approximated by Newton's law of universal gravitation, which describes gravity as a force which causes any two bodies to be attracted to each other, with the force proportional to the product of their masses and inversely proportional to the square of the distance between them.
Gravity is the weakest of the four fundamental forces of physics, approximately 1038 times weaker than the strong force, 1036 times weaker than the electromagnetic force and 1029 times weaker than the weak force. As a consequence, it has no significant influence at the level of subatomic particles.[2] In contrast, it is the dominant force at the macroscopic scale, and is the cause of the formation, shape and trajectory (orbit) of astronomical bodies. For example, gravity causes the Earth and the other planets to orbit the Sun, it also causes the Moon to orbit the Earth, and causes the formation of tides, the formation and evolution of the Solar System, stars and galaxies.
The earliest instance of gravity in the Universe, possibly in the form of quantum gravity, supergravity or a gravitational singularity, along with ordinary space and time, developed during the Planck epoch (up to 10−43 seconds after the birth of the Universe), possibly from a primeval state, such as a false vacuum, quantum vacuum or virtual particle, in a currently unknown manner.[3] Attempts to develop a theory of gravity consistent with quantum mechanics, a quantum gravity theory, which would allow gravity to be united in a common mathematical framework (a theory of everything) with the other three forces of physics, are a current area of research.
Contents
[hide]
1 History of gravitational theory
1.1 Scientific revolution
1.2 Newton's theory of gravitation
1.3 Equivalence principle
1.4 General relativity
1.4.1 Solutions
1.4.2 Tests
1.5 Gravity and quantum mechanics
2 Specifics
2.1 Earth's gravity
2.2 Equations for a falling body near the surface of the Earth
2.3 Gravity and astronomy
2.4 Gravitational radiation
2.5 Speed of gravity
3 Anomalies and discrepancies
4 Alternative theories
4.1 Historical alternative theories
4.2 Modern alternative theories
5 See also
6 Footnotes
7 References
8 Further reading
9 External links
History of gravitational theory
Main article: History of gravitational theory
Scientific revolution
Main article: Scientific revolution
Modern work on gravitational theory began with the work of Galileo Galilei in the late 16th and early 17th centuries. In his famous (though possibly apocryphal[4]) experiment dropping balls from the Tower of Pisa, and later with careful measurements of balls rolling down inclines, Galileo showed that gravitational acceleration is the same for all objects. This was a major departure from Aristotle's belief that heavier objects have a higher gravitational acceleration.[5] Galileo postulated air resistance as the reason that objects with less mass fall more slowly in an atmosphere. Galileo's work set the stage for the formulation of Newton's theory of gravity.[6]
Newton's theory of gravitation
Main article: Newton's law of universal gravitation
Sir Isaac Newton, an English physicist who lived from 1642 to 1727
In 1687, English mathematician Sir Isaac Newton published Principia, which hypothesizes the inverse-square law of universal gravitation. In his own words, "I deduced that the forces which keep the planets in their orbs must [be] reciprocally as the squares of their distances from the centers about which they revolve: and thereby compared the force requisite to keep the Moon in her Orb with the force of gravity at the surface of the Earth; and found them answer pretty nearly."[7] The equation is the following:
F = G m 1 m 2 r 2 {\displaystyle F=G{\frac {m_{1}m_{2}}{r^{2}}}\ }
Where F is the force, m1 and m2 are the masses of the objects interacting, r is the distance between the centers of the masses and G is the gravitational constant.
Newton's theory enjoyed its greatest success when it was used to predict the existence of Neptune based on motions of Uranus that could not be accounted for by the actions of the other planets. Calculations by both John Couch Adams and Urbain Le Verrier predicted the general position of the planet, and Le Verrier's calculations are what led Johann Gottfried Galle to the discovery of Neptune.
A discrepancy in Mercury's orbit pointed out flaws in Newton's theory. By the end of the 19th century, it was known that its orbit showed slight perturbations that could not be accounted for entirely under Newton's theory, but all searches for another perturbing body (such as a planet orbiting the Sun even closer than Mercury) had been fruitless. The issue was resolved in 1915 by Albert Einstein's new theory of general relativity, which accounted for the small discrepancy in Mercury's orbit.
Although Newton's theory has been superseded by Einstein's general relativity, most modern non-relativistic gravitational calculations are still made using Newton's theory because it is simpler to work with and it gives sufficiently accurate results for most applications involving sufficiently small masses, speeds and energies.
Equivalence principle
The equivalence principle, explored by a succession of researchers including Galileo, Loránd Eötvös, and Einstein, expresses the idea that all objects fall in the same way, and that the effects of gravity are indistinguishable from certain aspects of acceleration and deceleration. The simplest way to test the weak equivalence principle is to drop two objects of different masses or compositions in a vacuum and see whether they hit the ground at the same time. Such experiments demonstrate that all objects fall at the same rate when other forces (such as air resistance and electromagnetic effects) are negligible. More sophisticated tests use a torsion balance of a type invented by Eötvös. Satellite experiments, for example STEP, are planned for more accurate experiments in space.[8]
Formulations of the equivalence principle include:
The weak equivalence principle: The trajectory of a point mass in a gravitational field depends only on its initial position and velocity, and is independent of its composition.[9]
The Einsteinian equivalence principle: The outcome of any local non-gravitational experiment in a freely falling laboratory is independent of the velocity of the laboratory and its location in spacetime.[10]
The strong equivalence principle requiring both of the above.
General relativity
See also: Introduction to general relativity
Two-dimensional analogy of spacetime distortion generated by the mass of an object. Matter changes the geometry of spacetime, this (curved) geometry being interpreted as gravity. White lines do not represent the curvature of space but instead represent the coordinate system imposed on the curved spacetime, which would be rectilinear in a flat spacetime.
Part of a series of articles about
General relativity
G μ ν + Λ g μ ν = 8 π G c 4 T μ ν {\displaystyle G_{\mu \nu }+\Lambda g_{\mu \nu }={8\pi G \over c^{4}}T_{\mu \nu }}
Introduction
History
Mathematical formulation
Tests
Fundamental concepts[show]
Principle of relativity
Theory of relativity
Frame of reference
Inertial frame of reference
Rest frame
Center-of-momentum frame
Equivalence principle
Mass–energy equivalence
Special relativity
Doubly special relativity
de Sitter invariant special relativity
World line
Riemannian geometry
Phenomena[show]
Gravitoelectromagnetism
Kepler problem
Gravity
Gravitational field
Gravity well
Gravitational lensing
Gravitational waves
Gravitational redshift
Redshift
Blueshift
Time dilation
Gravitational time dilation
Shapiro time delay
Gravitational potential
Gravitational compression
Gravitational collapse
Frame-dragging
Geodetic effect
Gravitational singularity
Event horizon
Naked singularity
Black hole
White hole
Spacetime
Space
Time
Spacetime diagrams
Minkowski spacetime
Closed timelike curve (CTC)
Wormhole
Ellis wormhole
Equations
Formalisms
[show]
Equations
Linearized gravity
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Friedmann
Geodesics
Mathisson–Papapetrou–Dixon
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Advanced theory
Kaluza–Klein theory
Quantum gravity
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Solutions[show]
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Vacuum solution
Scientists[show]
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In general relativity, the effects of gravitation are ascribed to spacetime curvature instead of a force. The starting point for general relativity is the equivalence principle, which equates free fall with inertial motion and describes free-falling inertial objects as being accelerated relative to non-inertial observers on the ground.[11][12] In Newtonian physics, however, no such acceleration can occur unless at least one of the objects is being operated on by a force.
Einstein proposed that spacetime is curved by matter, and that free-falling objects are moving along locally straight paths in curved spacetime. These straight paths are called geodesics. Like Newton's first law of motion, Einstein's theory states that if a force is applied on an object, it would deviate from a geodesic. For instance, we are no longer following geodesics while standing because the mechanical resistance of the Earth exerts an upward force on us, and we are non-inertial on the ground as a result. This explains why moving along the geodesics in spacetime is considered inertial.
Einstein discovered the field equations of general relativity, which relate the presence of matter and the curvature of spacetime and are named after him. The Einstein field equations are a set of 10 simultaneous, non-linear, differential equations. The solutions of the field equations are the components of the metric tensor of spacetime. A metric tensor describes a geometry of spacetime. The geodesic paths for a spacetime are calculated from the metric tensor.
Solutions
Notable solutions of the Einstein field equations include:
The Schwarzschild solution, which describes spacetime surrounding a spherically symmetric non-rotating uncharged massive object. For compact enough objects, this solution generated a black hole with a central singularity. For radial distances from the center which are much greater than the Schwarzschild radius, the accelerations predicted by the Schwarzschild solution are practically identical to those predicted by Newton's theory of gravity.
The Reissner-Nordström solution, in which the central object has an electrical charge. For charges with a geometrized length which are less than the geometrized length of the mass of the object, this solution produces black holes with double event horizons.
The Kerr solution for rotating massive objects. This solution also produces black holes with multiple event horizons.
The Kerr-Newman solution for charged, rotating massive objects. This solution also produces black holes with multiple event horizons.
The cosmological Friedmann-Lemaître-Robertson-Walker solution, which predicts the expansion of the Universe.
Tests
The tests of general relativity included the following:[13]
General relativity accounts for the anomalous perihelion precession of Mercury.[14]
The prediction that time runs slower at lower potentials (gravitational time dilation) has been confirmed by the Pound–Rebka experiment (1959), the Hafele–Keating experiment, and the GPS.
The prediction of the deflection of light was first confirmed by Arthur Stanley Eddington from his observations during the Solar eclipse of 29 May 1919.[15][16] Eddington measured starlight deflections twice those predicted by Newtonian corpuscular theory, in accordance with the predictions of general relativity. However, his interpretation of the results was later disputed.[17] More recent tests using radio interferometric measurements of quasars passing behind the Sun have more accurately and consistently confirmed the deflection of light to the degree predicted by general relativity.[18] See also gravitational lens.
The time delay of light passing close to a massive object was first identified by Irwin I. Shapiro in 1964 in interplanetary spacecraft signals.
Gravitational radiation has been indirectly confirmed through studies of binary pulsars. On 11 February 2016, the LIGO and Virgo collaborations announced the first observation of a gravitational wave.
Alexander Friedmann in 1922 found that Einstein equations have non-stationary solutions (even in the presence of the cosmological constant). In 1927 Georges Lemaître showed that static solutions of the Einstein equations, which are possible in the presence of the cosmological constant, are unstable, and therefore the static Universe envisioned by Einstein could not exist. Later, in 1931, Einstein himself agreed with the results of Friedmann and Lemaître. Thus general relativity predicted that the Universe had to be non-static—it had to either expand or contract. The expansion of the Universe discovered by Edwin Hubble in 1929 confirmed this prediction.[19]
The theory's prediction of frame dragging was consistent with the recent Gravity Probe B results.[20]
General relativity predicts that light should lose its energy when traveling away from massive bodies through gravitational redshift. This was verified on earth and in the solar system around 1960.
Gravity and quantum mechanics
Main articles: Graviton and Quantum gravity
In the decades after the discovery of general relativity, it was realized that general relativity is incompatible with quantum mechanics.[21] It is possible to describe gravity in the framework of quantum field theory like the other fundamental forces, such that the attractive force of gravity arises due to exchange of virtual gravitons, in the same way as the electromagnetic force arises from exchange of virtual photons.[22][23] This reproduces general relativity in the classical limit. However, this approach fails at short distances of the order of the Planck length,[21] where a more complete theory of quantum gravity (or a new approach to quantum mechanics) is required.
Specifics
Earth's gravity
An initially-stationary object which is allowed to fall freely under gravity drops a distance which is proportional to the square of the elapsed time. This image spans half a second and was captured at 20 flashes per second.
Main article: Earth's gravity
Every planetary body (including the Earth) is surrounded by its own gravitational field, which can be conceptualized with Newtonian physics as exerting an attractive force on all objects. Assuming a spherically symmetrical planet, the strength of this field at any given point above the surface is proportional to the planetary body's mass and inversely proportional to the square of the distance from the center of the body.
If an object with comparable mass to that of the Earth were to fall towards it, then the corresponding acceleration of the Earth would be observable.
The strength of the gravitational field is numerically equal to the acceleration of objects under its influence.[24] The rate of acceleration of falling objects near the Earth's surface varies very slightly depending on latitude, surface features such as mountains and ridges, and perhaps unusually high or low sub-surface densities.[25] For purposes of weights and measures, a standard gravity value is defined by the International Bureau of Weights and Measures, under the International System of Units (SI).
That value, denoted g, is g = 9.80665 m/s2 (32.1740 ft/s2).[26][27]
The standard value of 9.80665 m/s2 is the one originally adopted by the International Committee on Weights and Measures in 1901 for 45° latitude, even though it has been shown to be too high by about five parts in ten thousand.[28] This value has persisted in meteorology and in some standard atmospheres as the value for 45° latitude even though it applies more precisely to latitude of 45°32'33".[29]
Assuming the standardized value for g and ignoring air resistance, this means that an object falling freely near the Earth's surface increases its velocity by 9.80665 m/s (32.1740 ft/s or 22 mph) for each second of its descent. Thus, an object starting from rest will attain a velocity of 9.80665 m/s (32.1740 ft/s) after one second, approximately 19.62 m/s (64.4 ft/s) after two seconds, and so on, adding 9.80665 m/s (32.1740 ft/s) to each resulting velocity. Also, again ignoring air resistance, any and all objects, when dropped from the same height, will hit the ground at the same time.
According to Newton's 3rd Law, the Earth itself experiences a force equal in magnitude and opposite in direction to that which it exerts on a falling object. This means that the Earth also accelerates towards the object until they collide. Because the mass of the Earth is huge, however, the acceleration imparted to the Earth by this opposite force is negligible in comparison to the object's. If the object doesn't bounce after it has collided with the Earth, each of them then exerts a repulsive contact force on the other which effectively balances the attractive force of gravity and prevents further acceleration.
The apparent force of gravity on Earth is the resultant (vector sum) of two forces:[30] (a) The gravitational attraction in accordance with Newton's universal law of gravitation, and (b) the centrifugal force, which results from the choice of an earthbound, rotating frame of reference. The force of gravity is the weakest at the equator because of the centrifugal force caused by the Earth's rotation and because points on the equator are furthest from the center of the Earth. The force of gravity varies with latitude and increases from about 9.780 m/s2 at the Equator to about 9.832 m/s2 at the poles.
Equations for a falling body near the surface of the Earth
Main article: Equations for a falling body
Under an assumption of constant gravitational attraction, Newton's law of universal gravitation simplifies to F = mg, where m is the mass of the body and g is a constant vector with an average magnitude of 9.81 m/s2 on Earth. This resulting force is the object's weight. The acceleration due to gravity is equal to this g. An initially stationary object which is allowed to fall freely under gravity drops a distance which is proportional to the square of the elapsed time. The image on the right, spanning half a second, was captured with a stroboscopic flash at 20 flashes per second. During the first ​1⁄20 of a second the ball drops one unit of distance (here, a unit is about 12 mm); by ​2⁄20 it has dropped at total of 4 units; by ​3⁄20, 9 units and so on.
Under the same constant gravity assumptions, the potential energy, Ep, of a body at height h is given by Ep = mgh (or Ep = Wh, with W meaning weight). This expression is valid only over small distances h from the surface of the Earth. Similarly, the expression h = v 2 2 g {\displaystyle h={\tfrac {v^{2}}{2g}}} for the maximum height reached by a vertically projected body with initial velocity v is useful for small heights and small initial velocities only.
Gravity and astronomy
Gravity acts on stars that form the Milky Way.[31]
The application of Newton's law of gravity has enabled the acquisition of much of the detailed information we have about the planets in the Solar System, the mass of the Sun, and details of quasars; even the existence of dark matter is inferred using Newton's law of gravity. Although we have not traveled to all the planets nor to the Sun, we know their masses. These masses are obtained by applying the laws of gravity to the measured characteristics of the orbit. In space an object maintains its orbit because of the force of gravity acting upon it. Planets orbit stars, stars orbit galactic centers, galaxies orbit a center of mass in clusters, and clusters orbit in superclusters. The force of gravity exerted on one object by another is directly proportional to the product of those objects' masses and inversely proportional to the square of the distance between them.
The earliest gravity (possibly in the form of quantum gravity, supergravity or a gravitational singularity), along with ordinary space and time, developed during the Planck epoch (up to 10−43 seconds after the birth of the Universe), possibly from a primeval state (such as a false vacuum, quantum vacuum or virtual particle), in a currently unknown manner.[3]
Gravitational radiation
Main article: Gravitational wave
According to general relativity, gravitational radiation is generated in situations where the curvature of spacetime is oscillating, such as is the case with co-orbiting objects. The gravitational radiation emitted by the Solar System is far too small to measure. However, gravitational radiation has been indirectly observed as an energy loss over time in binary pulsar systems such as PSR B1913+16. It is believed that neutron star mergers and black hole formation may create detectable amounts of gravitational radiation. Gravitational radiation observatories such as the Laser Interferometer Gravitational Wave Observatory (LIGO) have been created to study the problem. In February 2016, the Advanced LIGO team announced that they had detected gravitational waves from a black hole collision. On 14 September 2015, LIGO registered gravitational waves for the first time, as a result of the collision of two black holes 1.3 billion light-years from Earth.[32][33] This observation confirms the theoretical predictions of Einstein and others that such waves exist. The event confirms that binary black holes exist. It also opens the way for practical observation and understanding of the nature of gravity and events in the Universe including the Big Bang and what happened after it.[34][35]
Speed of gravity
Main article: Speed of gravity
In December 2012, a research team in China announced that it had produced measurements of the phase lag of Earth tides during full and new moons which seem to prove that the speed of gravity is equal to the speed of light.[36] This means that if the Sun suddenly disappeared, the Earth would keep orbiting it normally for 8 minutes, which is the time light takes to travel that distance. The team's findings were released in the Chinese Science Bulletin in February 2013.[37]
In October 2017, the LIGO and Virgo detectors received gravitational wave signals within 2 seconds of gamma ray satellites and optical telescopes seeing signals from the same direction. This confirmed that the speed of gravitational waves was the same as the speed of light.[38]
Anomalies and discrepancies
There are some observations that are not adequately accounted for, which may point to the need for better theories of gravity or perhaps be explained in other ways.
Rotation curve of a typical spiral galaxy: predicted (A) and observed (B). The discrepancy between the curves is attributed to dark matter.
Extra-fast stars: Stars in galaxies follow a distribution of velocities where stars on the outskirts are moving faster than they should according to the observed distributions of normal matter. Galaxies within galaxy clusters show a similar pattern. Dark matter, which would interact through gravitation but not electromagnetically, would account for the discrepancy. Various modifications to Newtonian dynamics have also been proposed.
Flyby anomaly: Various spacecraft have experienced greater acceleration than expected during gravity assist maneuvers.
Accelerating expansion: The metric expansion of space seems to be speeding up. Dark energy has been proposed to explain this. A recent alternative explanation is that the geometry of space is not homogeneous (due to clusters of galaxies) and that when the data are reinterpreted to take this into account, the expansion is not speeding up after all,[39] however this conclusion is disputed.[40]
Anomalous increase of the astronomical unit: Recent measurements indicate that planetary orbits are widening faster than if this were solely through the Sun losing mass by radiating energy.
Extra energetic photons: Photons travelling through galaxy clusters should gain energy and then lose it again on the way out. The accelerating expansion of the Universe should stop the photons returning all the energy, but even taking this into account photons from the cosmic microwave background radiation gain twice as much energy as expected. This may indicate that gravity falls off faster than inverse-squared at certain distance scales.[41]
Extra massive hydrogen clouds: The spectral lines of the Lyman-alpha forest suggest that hydrogen clouds are more clumped together at certain scales than expected and, like dark flow, may indicate that gravity falls off slower than inverse-squared at certain distance scales.[41]
Alternative theories
Main article: Alternatives to general relativity
Historical alternative theories
Aristotelian theory of gravity
Le Sage's theory of gravitation (1784) also called LeSage gravity, proposed by Georges-Louis Le Sage, based on a fluid-based explanation where a light gas fills the entire Universe.
Ritz's theory of gravitation, Ann. Chem. Phys. 13, 145, (1908) pp. 267–71, Weber-Gauss electrodynamics applied to gravitation. Classical advancement of perihelia.
Nordström's theory of gravitation (1912, 1913), an early competitor of general relativity.
Kaluza Klein theory (1921)
Whitehead's theory of gravitation (1922), another early competitor of general relativity.
Modern alternative theories
Brans–Dicke theory of gravity (1961)[42]
Induced gravity (1967), a proposal by Andrei Sakharov according to which general relativity might arise from quantum field theories of matter
ƒ(R) gravity (1970)
Horndeski theory (1974)[43]
Supergravity (1976)
String theory
In the modified Newtonian dynamics (MOND) (1981), Mordehai Milgrom proposes a modification of Newton's second law of motion for small accelerations[44]
The self-creation cosmology theory of gravity (1982) by G.A. Barber in which the Brans-Dicke theory is modified to allow mass creation
Loop quantum gravity (1988) by Carlo Rovelli, Lee Smolin, and Abhay Ashtekar
Nonsymmetric gravitational theory (NGT) (1994) by John Moffat
Conformal gravity[45]
Tensor–vector–scalar gravity (TeVeS) (2004), a relativistic modification of MOND by Jacob Bekenstein
Gravity as an entropic force, gravity arising as an emergent phenomenon from the thermodynamic concept of entropy.
In the superfluid vacuum theory the gravity and curved space-time arise as a collective excitation mode of non-relativistic background superfluid.
Chameleon theory (2004) by Justin Khoury and Amanda Weltman.
Pressuron theory (2013) by Olivier Minazzoli and Aurélien Hees.
See also
Angular momentum
Anti-gravity, the idea of neutralizing or repelling gravity
Artificial gravity
Birkeland current
Einstein–Infeld–Hoffmann equations
Escape velocity, the minimum velocity needed to escape from a gravity well
g-force, a measure of acceleration
Gauge gravitation theory
Gauss's law for gravity
Gravitational binding energy
Gravitational potential
Gravitational wave
Gravitational wave background
Gravity gradiometry
Gravity Recovery and Climate Experiment
Gravity Research Foundation
Jovian–Plutonian gravitational effect
Kepler's third law of planetary motion
Lagrangian point
Micro-g environment, also called microgravity
Mixmaster universe
n-body problem
Newton's laws of motion
Pioneer anomaly
Scalar theories of gravitation
Speed of gravity
Standard gravitational parameter
Weightlessness
Footnotes
Jump up ^ "HubbleSite: Black Holes: Gravity's Relentless Pull". hubblesite.org. Retrieved 2016-10-07.
Jump up ^ Krebs, Robert E. (1999). Scientific Development and Misconceptions Through the Ages: A Reference Guide (illustrated ed.). Greenwood Publishing Group. p. 133. ISBN 978-0-313-30226-8. Extract of page 133
^ Jump up to: a b Staff. "Birth of the Universe". University of Oregon. Retrieved 24 September 2016. – discusses "Planck time" and "Planck era" at the very beginning of the Universe
Jump up ^ Ball, Phil (June 2005). "Tall Tales". Nature News. doi:10.1038/news050613-10.
Jump up ^ Galileo (1638), Two New Sciences, First Day Salviati speaks: "If this were what Aristotle meant you would burden him with another error which would amount to a falsehood; because, since there is no such sheer height available on earth, it is clear that Aristotle could not have made the experiment; yet he wishes to give us the impression of his having performed it when he speaks of such an effect as one which we see."
Jump up ^ Bongaarts, Peter (2014). Quantum Theory: A Mathematical Approach (illustrated ed.). Springer. p. 11. ISBN 978-3-319-09561-5. Extract of page 11
Jump up ^ * Chandrasekhar, Subrahmanyan (2003). Newton's Principia for the common reader. Oxford: Oxford University Press. (pp. 1–2). The quotation comes from a memorandum thought to have been written about 1714. As early as 1645 Ismaël Bullialdus had argued that any force exerted by the Sun on distant objects would have to follow an inverse-square law. However, he also dismissed the idea that any such force did exist. See, for example, Linton, Christopher M. (2004). From Eudoxus to Einstein—A History of Mathematical Astronomy. Cambridge: Cambridge University Press. p. 225. ISBN 978-0-521-82750-8.
Jump up ^ M.C.W.Sandford (2008). "STEP: Satellite Test of the Equivalence Principle". Rutherford Appleton Laboratory. Archived from the original on 28 September 2011. Retrieved 14 October 2011.
Jump up ^ Paul S Wesson (2006). Five-dimensional Physics. World Scientific. p. 82. ISBN 981-256-661-9.
Jump up ^ Haugen, Mark P.; C. Lämmerzahl (2001). Principles of Equivalence: Their Role in Gravitation Physics and Experiments that Test Them. Springer. arXiv:gr-qc/0103067  . Bibcode:2001LNP...562..195H. doi:10.1007/3-540-40988-2_10. ISBN 978-3-540-41236-6.
Jump up ^ "Gravity and Warped Spacetime". black-holes.org. Archived from the original on 21 June 2011. Retrieved 2010-10-16.
Jump up ^ Dmitri Pogosyan. "Lecture 20: Black Holes—The Einstein Equivalence Principle". University of Alberta. Retrieved 2011-10-14.
Jump up ^ Pauli, Wolfgang Ernst (1958). "Part IV. General Theory of Relativity". Theory of Relativity. Courier Dover Publications. ISBN 978-0-486-64152-2.
Jump up ^ Max Born (1924), Einstein's Theory of Relativity (The 1962 Dover edition, page 348 lists a table documenting the observed and calculated values for the precession of the perihelion of Mercury, Venus, and Earth.)
Jump up ^ Dyson, F.W.; Eddington, A.S.; Davidson, C.R. (1920). "A Determination of the Deflection of Light by the Sun's Gravitational Field, from Observations Made at the Total Eclipse of May 29, 1919". Phil. Trans. Roy. Soc. A. 220 (571–581): 291–333. Bibcode:1920RSPTA.220..291D. doi:10.1098/rsta.1920.0009. . Quote, p. 332: "Thus the results of the expeditions to Sobral and Principe can leave little doubt that a deflection of light takes place in the neighbourhood of the sun and that it is of the amount demanded by Einstein's generalised theory of relativity, as attributable to the sun's gravitational field."
Jump up ^ Weinberg, Steven (1972). Gravitation and cosmology. John Wiley & Sons. . Quote, p. 192: "About a dozen stars in all were studied, and yielded values 1.98 ± 0.11" and 1.61 ± 0.31", in substantial agreement with Einstein's prediction θ☉ = 1.75"."
Jump up ^ Earman, John; Glymour, Clark (1980). "Relativity and Eclipses: The British eclipse expeditions of 1919 and their predecessors". Historical Studies in the Physical Sciences. 11: 49–85. doi:10.2307/27757471.
Jump up ^ Weinberg, Steven (1972). Gravitation and cosmology. John Wiley & Sons. p. 194.
Jump up ^ See W.Pauli, 1958, pp. 219–20
Jump up ^ "NASA's Gravity Probe B Confirms Two Einstein Space-Time Theories". Nasa.gov. Retrieved 2013-07-23.
^ Jump up to: a b Randall, Lisa (2005). Warped Passages: Unraveling the Universe's Hidden Dimensions. Ecco. ISBN 0-06-053108-8.
Jump up ^ Feynman, R. P.; Morinigo, F. B.; Wagner, W. G.; Hatfield, B. (1995). Feynman lectures on gravitation. Addison-Wesley. ISBN 0-201-62734-5.
Jump up ^ Zee, A. (2003). Quantum Field Theory in a Nutshell. Princeton University Press. ISBN 0-691-01019-6.
Jump up ^ Cantor, G.N.; Christie, J.R.R.; Hodge, M.J.S.; Olby, R.C. (2006). Companion to the History of Modern Science. Routledge. p. 448. ISBN 978-1-134-97751-2. Extract of page 448
Jump up ^ Nemiroff, R.; Bonnell, J., eds. (15 December 2014). "The Potsdam Gravity Potato". Astronomy Picture of the Day. NASA.
Jump up ^ Bureau International des Poids et Mesures (2006). "The International System of Units (SI)" (PDF) (8th ed.): 131. Retrieved 2009-11-25. Unit names are normally printed in Roman (upright) type ... Symbols for quantities are generally single letters set in an italic font, although they may be qualified by further information in subscripts or superscripts or in brackets.
Jump up ^ "SI Unit rules and style conventions". National Institute For Standards and Technology (USA). September 2004. Retrieved 2009-11-25. Variables and quantity symbols are in italic type. Unit symbols are in Roman type.
Jump up ^ List, R. J. editor, 1968, Acceleration of Gravity, Smithsonian Meteorological Tables, Sixth Ed. Smithsonian Institution, Washington, D.C., p. 68.
Jump up ^ U.S. Standard Atmosphere, 1976, U.S. Government Printing Office, Washington, D.C., 1976. (Linked file is very large.)
Jump up ^ Hofmann-Wellenhof, B.; Moritz, H. (2006). Physical Geodesy (2nd ed.). Springer. ISBN 978-3-211-33544-4. § 2.1: “The total force acting on a body at rest on the earth’s surface is the resultant of gravitational force and the centrifugal force of the earth’s rotation and is called gravity.”
Jump up ^ "Milky Way Emerges as Sun Sets over Paranal". www.eso.org. European Southern Obseevatory. Retrieved 29 April 2015.
Jump up ^ Clark, Stuart (2016-02-11). "Gravitational waves: scientists announce 'we did it!' – live". the Guardian. Retrieved 2016-02-11.
Jump up ^ Castelvecchi, Davide; Witze, Witze (11 February 2016). "Einstein's gravitational waves found at last". Nature News. doi:10.1038/nature.2016.19361. Retrieved 2016-02-11.
Jump up ^ "Scientists announce finding Gravitational Waves confirming Einstein's theory". WorldBreakingNews.
Jump up ^ "WHAT ARE GRAVITATIONAL WAVES AND WHY DO THEY MATTER?". popsci.com. Retrieved 12 February 2016.
Jump up ^ Chinese scientists find evidence for speed of gravity, astrowatch.com, 12/28/12.
Jump up ^ TANG, Ke Yun; HUA ChangCai; WEN Wu; CHI ShunLiang; YOU QingYu; YU Dan (February 2013). "Observational evidences for the speed of the gravity based on the Earth tide" (PDF). Chinese Science Bulletin. 58 (4-5): 474–77. Bibcode:2013ChSBu..58..474T. doi:10.1007/s11434-012-5603-3. Retrieved 12 June 2013.
Jump up ^ "GW170817 Press Release". LIGO Lab - Caltech.
Jump up ^ Dark energy may just be a cosmic illusion, New Scientist, issue 2646, 7 March 2008.
Jump up ^ Swiss-cheese model of the cosmos is full of holes, New Scientist, issue 2678, 18 October 2008.
^ Jump up to: a b Chown, Marcus (16 March 2009). "Gravity may venture where matter fears to tread". New Scientist. Retrieved 4 August 2013.
Jump up ^ Brans, C.H. (Mar 2014). "Jordan-Brans-Dicke Theory". Scholarpedia. 9: 31358. Bibcode:2014Schpj...931358B. doi:10.4249/scholarpedia.31358.
Jump up ^ Horndeski, G.W. (Sep 1974). "Second-Order Scalar-Tensor Field Equations in a Four-Dimensional Space". International Journal of Theoretical Physics. 88 (10): 363–84. Bibcode:1974IJTP...10..363H. doi:10.1007/BF01807638.
Jump up ^ Milgrom, M. (Jun 2014). "The MOND paradigm of modified dynamics". Scholarpedia. 9: 31410. Bibcode:2014SchpJ...931410M. doi:10.4249/scholarpedia.31410.
Jump up ^ "Einstein gravity from conformal gravity" (PDF).
References
Halliday, David; Robert Resnick; Kenneth S. Krane (2001). Physics v. 1. New York: John Wiley & Sons. ISBN 0-471-32057-9.
Serway, Raymond A.; Jewett, John W. (2004). Physics for Scientists and Engineers (6th ed.). Brooks/Cole. ISBN 0-534-40842-7.
Tipler, Paul (2004). Physics for Scientists and Engineers: Mechanics, Oscillations and Waves, Thermodynamics (5th ed.). W. H. Freeman. ISBN 0-7167-0809-4.
Further reading
Thorne, Kip S.; Misner, Charles W.; Wheeler, John Archibald (1973). Gravitation. W.H. Freeman. ISBN 0-7167-0344-0.
External links
Look up gravity in Wiktionary, the free dictionary.
Wikimedia Commons has media related to Gravitation.
Wikisource has the text of the 1911 Encyclopædia Britannica article Gravitation.
Hazewinkel, Michiel, ed. (2001) [1994], "Gravitation", Encyclopedia of Mathematics, Springer Science+Business Media B.V. / Kluwer Academic Publishers, ISBN 978-1-55608-010-4
Hazewinkel, Michiel, ed. (2001) [1994], "Gravitation, theory of", Encyclopedia of Mathematics, Springer Science+Business Media B.V. / Kluwer Academic Publishers, ISBN 978-1-55608-010-4
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interlanguage-link interwiki-af display: none;
html
local
a
href title lang hreflang class
https://als.wikipedia.org/wiki/Gravitation Gravitation – Alemannisch als als interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-als display: none;
html
local
a
href title lang hreflang class
https://am.wikipedia.org/wiki/%E1%8C%8D%E1%88%B5%E1%89%A0%E1%89%B5 ግስበት – Amharic am am interlanguage-link-target
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li
class style
interlanguage-link interwiki-am display: none;
html
local
a
href title lang hreflang class
https://ar.wikipedia.org/wiki/%D8%AC%D8%A7%D8%B0%D8%A8%D9%8A%D8%A9_(%D9%81%D9%8A%D8%B2%D9%8A%D8%A7%D8%A1) جاذبية (فيزياء) – Arabic ar ar interlanguage-link-target
html
local
li
class
interlanguage-link interwiki-ar
html
local
a
href title lang hreflang class
https://an.wikipedia.org/wiki/Gravedat Gravedat – Aragonese an an interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-an display: none;
html
local
a
href title lang hreflang class
https://as.wikipedia.org/wiki/%E0%A6%AE%E0%A6%B9%E0%A6%BE%E0%A6%95%E0%A7%B0%E0%A7%8D%E0%A6%B7%E0%A6%A3 মহাকৰ্ষণ – Assamese as as interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-as display: none;
html
local
a
href title lang hreflang class
https://ast.wikipedia.org/wiki/Graved%C3%A1 Gravedá – Asturian ast ast interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-ast display: none;
html
local
a
href title lang hreflang class
https://az.wikipedia.org/wiki/Cazib%C9%99_q%C3%BCvv%C9%99si Cazibə qüvvəsi – Azerbaijani az az interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-az display: none;
html
local
a
href title lang hreflang class
https://bn.wikipedia.org/wiki/%E0%A6%AE%E0%A6%B9%E0%A6%BE%E0%A6%95%E0%A6%B0%E0%A7%8D%E0%A6%B7 মহাকর্ষ – Bangla bn bn interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-bn display: none;
html
local
a
href title lang hreflang class
https://zh-min-nan.wikipedia.org/wiki/Ti%C5%8Dng-le%CC%8Dk Tiōng-le̍k – Chinese (Min Nan) zh-min-nan zh-min-nan interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-zh-min-nan display: none;
html
local
a
href title lang hreflang class
https://ba.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%B2%D0%B8%D1%82%D0%B0%D1%86%D0%B8%D1%8F Гравитация – Bashkir ba ba interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ba display: none;
html
local
a
href title lang hreflang class
https://be.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%B2%D1%96%D1%82%D0%B0%D1%86%D1%8B%D1%8F Гравітацыя – Belarusian be be interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-be display: none;
html
local
a
href title lang hreflang class
https://be-x-old.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%B2%D1%96%D1%82%D0%B0%D1%86%D1%8B%D1%8F Гравітацыя – Belarusian (Taraškievica orthography) be-x-old be-x-old interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-be-x-old display: none;
html
local
a
href title lang hreflang class
https://bg.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%B2%D0%B8%D1%82%D0%B0%D1%86%D0%B8%D1%8F Гравитация – Bulgarian bg bg interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-bg display: none;
html
local
a
href title lang hreflang class
https://bar.wikipedia.org/wiki/Schwaakroft Schwaakroft – Bavarian bar bar interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-bar display: none;
html
local
a
href title lang hreflang class
https://bs.wikipedia.org/wiki/Gravitacija Gravitacija – Bosnian bs bs interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-bs display: none;
html
local
a
href title lang hreflang class
https://br.wikipedia.org/wiki/Gravitadur Gravitadur – Breton br br interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-br display: none;
html
local
a
href title lang hreflang class
https://ca.wikipedia.org/wiki/Gravetat Gravetat – Catalan ca ca interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ca display: none;
html
local
a
href title lang hreflang class
https://cs.wikipedia.org/wiki/Gravitace Gravitace – Czech cs cs interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-cs display: none;
html
local
a
href title lang hreflang class
https://sn.wikipedia.org/wiki/Gunganidzo Gunganidzo – Shona sn sn interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-sn display: none;
html
local
a
href title lang hreflang class
https://cy.wikipedia.org/wiki/Disgyrchiant Disgyrchiant – Welsh cy cy interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-cy display: none;
html
local
a
href title lang hreflang class
https://da.wikipedia.org/wiki/Gravitation Gravitation – Danish da da interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-da display: none;
html
local
a
href title lang hreflang class
https://de.wikipedia.org/wiki/Gravitation Gravitation – German de de interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-de display: none;
html
local
a
href title lang hreflang class
https://et.wikipedia.org/wiki/Gravitatsioon Gravitatsioon – Estonian et et interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-et display: none;
html
local
a
href title lang hreflang class
https://el.wikipedia.org/wiki/%CE%92%CE%B1%CF%81%CF%8D%CF%84%CE%B7%CF%84%CE%B1 Βαρύτητα – Greek el el interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-el display: none;
html
local
a
href title lang hreflang class
https://es.wikipedia.org/wiki/Gravedad Gravedad – Spanish es es interlanguage-link-target
html
local
li
class
interlanguage-link interwiki-es
html
local
a
href title lang hreflang class
https://eo.wikipedia.org/wiki/Gravito Gravito – Esperanto eo eo interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-eo display: none;
html
local
a
href title lang hreflang class
https://ext.wikipedia.org/wiki/Graved%C3%A1 Gravedá – Extremaduran ext ext interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ext display: none;
html
local
a
href title lang hreflang class
https://eu.wikipedia.org/wiki/Grabitazio Grabitazio – Basque eu eu interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-eu display: none;
html
local
a
href title lang hreflang class
https://fa.wikipedia.org/wiki/%DA%AF%D8%B1%D8%A7%D9%86%D8%B4 گرانش – Persian fa fa interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-fa display: none;
html
local
a
href title lang hreflang class
https://hif.wikipedia.org/wiki/Gravitation Gravitation – Fiji Hindi hif hif interlanguage-link-target
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local
li
class style
interlanguage-link interwiki-hif display: none;
html
local
a
href title lang hreflang class
https://fr.wikipedia.org/wiki/Gravitation Gravitation – French fr fr interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-fr display: none;
html
local
a
href title lang hreflang class
https://fy.wikipedia.org/wiki/Swiertekr%C3%AAft Swiertekrêft – Western Frisian fy fy interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-fy display: none;
html
local
a
href title lang hreflang class
https://ga.wikipedia.org/wiki/Imtharraingt Imtharraingt – Irish ga ga interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ga display: none;
html
local
a
href title lang hreflang class
https://gv.wikipedia.org/wiki/Ym-hayrn Ym-hayrn – Manx gv gv interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-gv display: none;
html
local
a
href title lang hreflang class
https://gd.wikipedia.org/wiki/Iom-tharraing Iom-tharraing – Scottish Gaelic gd gd interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-gd display: none;
html
local
a
href title lang hreflang class
https://gl.wikipedia.org/wiki/Gravidade Gravidade – Galician gl gl interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-gl display: none;
html
local
a
href title lang hreflang class
https://gu.wikipedia.org/wiki/%E0%AA%97%E0%AB%81%E0%AA%B0%E0%AB%81%E0%AA%A4%E0%AB%8D%E0%AA%B5%E0%AA%BE%E0%AA%95%E0%AA%B0%E0%AB%8D%E0%AA%B7%E0%AA%A3 ગુરુત્વાકર્ષણ – Gujarati gu gu interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-gu display: none;
html
local
a
href title lang hreflang class
https://ko.wikipedia.org/wiki/%EC%A4%91%EB%A0%A5 중력 – Korean ko ko interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ko display: none;
html
local
a
href title lang hreflang class
https://hy.wikipedia.org/wiki/%D5%81%D5%A3%D5%B8%D5%B2%D5%A1%D5%AF%D5%A1%D5%B6%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6 Ձգողականություն – Armenian hy hy interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-hy display: none;
html
local
a
href title lang hreflang class
https://hi.wikipedia.org/wiki/%E0%A4%97%E0%A5%81%E0%A4%B0%E0%A5%81%E0%A4%A4%E0%A5%8D%E0%A4%B5%E0%A4%BE%E0%A4%95%E0%A4%B0%E0%A5%8D%E0%A4%B7%E0%A4%A3 गुरुत्वाकर्षण – Hindi hi hi interlanguage-link-target
html
local
li
class
interlanguage-link interwiki-hi
html
local
a
href title lang hreflang class
https://hr.wikipedia.org/wiki/Gravitacija Gravitacija – Croatian hr hr interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-hr display: none;
html
local
a
href title lang hreflang class
https://io.wikipedia.org/wiki/Gravitado Gravitado – Ido io io interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-io display: none;
html
local
a
href title lang hreflang class
https://bpy.wikipedia.org/wiki/%E0%A6%85%E0%A6%AD%E0%A6%BF%E0%A6%95%E0%A6%B0%E0%A7%8D%E0%A6%B7 অভিকর্ষ – Bishnupriya bpy bpy interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-bpy display: none;
html
local
a
href title lang hreflang class
https://id.wikipedia.org/wiki/Gravitasi Gravitasi – Indonesian id id interlanguage-link-target
html
local
li
class
interlanguage-link interwiki-id
html
local
a
href title lang hreflang class
https://ia.wikipedia.org/wiki/Gravitation Gravitation – Interlingua ia ia interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ia display: none;
html
local
a
href title lang hreflang class
https://is.wikipedia.org/wiki/%C3%9Eyngdarafl Þyngdarafl – Icelandic is is interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-is display: none;
html
local
a
href title lang hreflang class
https://it.wikipedia.org/wiki/Interazione_gravitazionale Interazione gravitazionale – Italian it it interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-it display: none;
html
local
a
href title lang hreflang class
https://he.wikipedia.org/wiki/%D7%9B%D7%91%D7%99%D7%93%D7%94 כבידה – Hebrew he he interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-he display: none;
html
local
a
href title lang hreflang class
https://jv.wikipedia.org/wiki/Gravitasi Gravitasi – Javanese jv jv interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-jv display: none;
html
local
a
href title lang hreflang class
https://kn.wikipedia.org/wiki/%E0%B2%97%E0%B3%81%E0%B2%B0%E0%B3%81%E0%B2%A4%E0%B3%8D%E0%B2%B5 ಗುರುತ್ವ – Kannada kn kn interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-kn display: none;
html
local
a
href title lang hreflang class
https://ka.wikipedia.org/wiki/%E1%83%92%E1%83%A0%E1%83%90%E1%83%95%E1%83%98%E1%83%A2%E1%83%90%E1%83%AA%E1%83%98%E1%83%90 გრავიტაცია – Georgian ka ka interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ka display: none;
html
local
a
href title lang hreflang class
https://kk.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%B2%D0%B8%D1%82%D0%B0%D1%86%D0%B8%D1%8F Гравитация – Kazakh kk kk interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-kk display: none;
html
local
a
href title lang hreflang class
https://sw.wikipedia.org/wiki/Graviti Graviti – Swahili sw sw interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-sw display: none;
html
local
a
href title lang hreflang class
https://ku.wikipedia.org/wiki/Rak%C3%AA%C5%9F Rakêş – Kurdish ku ku interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ku display: none;
html
local
a
href title lang hreflang class
https://la.wikipedia.org/wiki/Gravitas_(physica) Gravitas (physica) – Latin la la interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-la display: none;
html
local
a
href title lang hreflang class
https://lv.wikipedia.org/wiki/Gravit%C4%81cija Gravitācija – Latvian lv lv interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-lv display: none;
html
local
a
href title lang hreflang class
https://lb.wikipedia.org/wiki/Gravitatioun Gravitatioun – Luxembourgish lb lb interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-lb display: none;
html
local
a
href title lang hreflang class
https://lt.wikipedia.org/wiki/Gravitacija Gravitacija – Lithuanian lt lt interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-lt display: none;
html
local
a
href title lang hreflang class
https://li.wikipedia.org/wiki/Zwaordjekraf Zwaordjekraf – Limburgish li li interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-li display: none;
html
local
a
href title lang hreflang class
https://jbo.wikipedia.org/wiki/maircpukai maircpukai – Lojban jbo jbo interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-jbo display: none;
html
local
a
href title lang hreflang class
https://lg.wikipedia.org/wiki/Essikirizo_(Gravity) Essikirizo (Gravity) – Ganda lg lg interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-lg display: none;
html
local
a
href title lang hreflang class
https://lmo.wikipedia.org/wiki/Forza_de_gravit%C3%A0 Forza de gravità – Lombard lmo lmo interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-lmo display: none;
html
local
a
href title lang hreflang class
https://hu.wikipedia.org/wiki/Gravit%C3%A1ci%C3%B3 Gravitáció – Hungarian hu hu interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-hu display: none;
html
local
a
href title lang hreflang class
https://mk.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%B2%D0%B8%D1%82%D0%B0%D1%86%D0%B8%D1%98%D0%B0 Гравитација – Macedonian mk mk interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-mk display: none;
html
local
a
href title lang hreflang class
https://ml.wikipedia.org/wiki/%E0%B4%97%E0%B5%81%E0%B4%B0%E0%B5%81%E0%B4%A4%E0%B5%8D%E0%B4%B5%E0%B4%BE%E0%B4%95%E0%B5%BC%E0%B4%B7%E0%B4%A3%E0%B4%82 ഗുരുത്വാകർഷണം – Malayalam ml ml interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ml display: none;
html
local
a
href title lang hreflang class
https://mr.wikipedia.org/wiki/%E0%A4%97%E0%A5%81%E0%A4%B0%E0%A5%81%E0%A4%A4%E0%A5%8D%E0%A4%B5%E0%A4%BE%E0%A4%95%E0%A4%B0%E0%A5%8D%E0%A4%B7%E0%A4%A3 गुरुत्वाकर्षण – Marathi mr mr interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-mr display: none;
html
local
a
href title lang hreflang class
https://xmf.wikipedia.org/wiki/%E1%83%92%E1%83%A0%E1%83%90%E1%83%95%E1%83%98%E1%83%A2%E1%83%90%E1%83%AA%E1%83%98%E1%83%90 გრავიტაცია – Mingrelian xmf xmf interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-xmf display: none;
html
local
a
href title lang hreflang class
https://ms.wikipedia.org/wiki/Graviti Graviti – Malay ms ms interlanguage-link-target
html
local
li
class
interlanguage-link interwiki-ms
html
local
a
href title lang hreflang class
https://mwl.wikipedia.org/wiki/Grabidade Grabidade – Mirandese mwl mwl interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-mwl display: none;
html
local
a
href title lang hreflang class
https://mn.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%B2%D0%B8%D1%82%D0%B0%D1%86%D0%B8 Гравитаци – Mongolian mn mn interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-mn display: none;
html
local
a
href title lang hreflang class
https://my.wikipedia.org/wiki/%E1%80%92%E1%80%BC%E1%80%95%E1%80%BA%E1%80%86%E1%80%BD%E1%80%B2%E1%80%A1%E1%80%AC%E1%80%B8 ဒြပ်ဆွဲအား – Burmese my my interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-my display: none;
html
local
a
href title lang hreflang class
https://nl.wikipedia.org/wiki/Zwaartekracht Zwaartekracht – Dutch nl nl interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-nl display: none;
html
local
a
href title lang hreflang class
https://ne.wikipedia.org/wiki/%E0%A4%97%E0%A5%81%E0%A4%B0%E0%A5%81%E0%A4%A4%E0%A5%8D%E0%A4%B5_%E0%A4%AC%E0%A4%B2 गुरुत्व बल – Nepali ne ne interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ne display: none;
html
local
a
href title lang hreflang class
https://new.wikipedia.org/wiki/%E0%A4%97%E0%A5%87%E0%A4%81%E0%A4%B8%E0%A5%81 गेँसु – Newari new new interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-new display: none;
html
local
a
href title lang hreflang class
https://ja.wikipedia.org/wiki/%E9%87%8D%E5%8A%9B 重力 – Japanese ja ja interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-ja display: none;
html
local
a
href title lang hreflang class
https://frr.wikipedia.org/wiki/Swaarkr%C3%A4%C3%A4ft Swaarkrääft – Northern Frisian frr frr interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-frr display: none;
html
local
a
href title lang hreflang class
https://no.wikipedia.org/wiki/Tyngdekraft Tyngdekraft – Norwegian no no interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-no display: none;
html
local
a
href title lang hreflang class
https://nn.wikipedia.org/wiki/Gravitasjon Gravitasjon – Norwegian Nynorsk nn nn interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-nn display: none;
html
local
a
href title lang hreflang class
https://nov.wikipedia.org/wiki/Gravitatione Gravitatione – Novial nov nov interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-nov display: none;
html
local
a
href title lang hreflang class
https://oc.wikipedia.org/wiki/Gravitacion Gravitacion – Occitan oc oc interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-oc display: none;
html
local
a
href title lang hreflang class
https://uz.wikipedia.org/wiki/Gravitatsiya Gravitatsiya – Uzbek uz uz interlanguage-link-target
html
local
li
class style
interlanguage-link interwiki-uz display: none;
html
local
a
href title lang hreflang class
https://pa.wikipedia.org/wiki/%E0%A8%97%E0%A9%81%E0%A8%B0%E0%A9%82%E0%A8%A4%E0%A8%BE_%E0%A8%96%E0%A8%BF%E0%A9%B1%E0%A8%9A ਗੁਰੂਤਾ ਖਿੱਚ – Punjabi pa pa interlanguage-link-target
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https://pnb.wikipedia.org/wiki/%DA%AF%D8%B1%DB%8C%D9%88%D9%B9%DB%8C گریوٹی – Western Punjabi pnb pnb interlanguage-link-target
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https://jam.wikipedia.org/wiki/Gravitieshan Gravitieshan – Jamaican Creole English jam jam interlanguage-link-target
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https://nds.wikipedia.org/wiki/Gravitatschoon Gravitatschoon – Low German nds nds interlanguage-link-target
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https://pl.wikipedia.org/wiki/Grawitacja Grawitacja – Polish pl pl interlanguage-link-target
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https://pt.wikipedia.org/wiki/Gravidade Gravidade – Portuguese pt pt interlanguage-link-target
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href title lang hreflang class
https://ro.wikipedia.org/wiki/Gravita%C8%9Bie Gravitație – Romanian ro ro interlanguage-link-target
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https://qu.wikipedia.org/wiki/Llasaturaku Llasaturaku – Quechua qu qu interlanguage-link-target
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https://rue.wikipedia.org/wiki/%D2%90%D1%80%D0%B0%D0%B2%D1%96%D1%82%D0%B0%D1%86%D1%96%D1%8F Ґравітація – Rusyn rue rue interlanguage-link-target
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https://ru.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%B2%D0%B8%D1%82%D0%B0%D1%86%D0%B8%D1%8F Гравитация – Russian ru ru interlanguage-link-target
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https://sa.wikipedia.org/wiki/%E0%A4%97%E0%A5%81%E0%A4%B0%E0%A5%81%E0%A4%A4%E0%A5%8D%E0%A4%B5%E0%A4%BE%E0%A4%95%E0%A4%B0%E0%A5%8D%E0%A4%B7%E0%A4%A3%E0%A4%B6%E0%A4%95%E0%A5%8D%E0%A4%A4%E0%A4%BF%E0%A4%83 गुरुत्वाकर्षणशक्तिः – Sanskrit sa sa interlanguage-link-target
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https://sc.wikipedia.org/wiki/Gravidade Gravidade – Sardinian sc sc interlanguage-link-target
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https://sco.wikipedia.org/wiki/Gravitation Gravitation – Scots sco sco interlanguage-link-target
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https://stq.wikipedia.org/wiki/Sweerkraft Sweerkraft – Saterland Frisian stq stq interlanguage-link-target
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https://sq.wikipedia.org/wiki/Graviteti Graviteti – Albanian sq sq interlanguage-link-target
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https://scn.wikipedia.org/wiki/Gravitazzioni_univirsali Gravitazzioni univirsali – Sicilian scn scn interlanguage-link-target
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https://sk.wikipedia.org/wiki/Gravit%C3%A1cia Gravitácia – Slovak sk sk interlanguage-link-target
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https://sl.wikipedia.org/wiki/Te%C5%BEnost Težnost – Slovenian sl sl interlanguage-link-target
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https://so.wikipedia.org/wiki/Cufisjiidad Cufisjiidad – Somali so so interlanguage-link-target
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a
href title lang hreflang class
https://sh.wikipedia.org/wiki/Gravitacija Gravitacija – Serbo-Croatian sh sh interlanguage-link-target
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li
class style
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href title lang hreflang class
https://su.wikipedia.org/wiki/Gravitasi Gravitasi – Sundanese su su interlanguage-link-target
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https://fi.wikipedia.org/wiki/Painovoima Painovoima – Finnish fi fi interlanguage-link-target
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class style
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a
href title lang hreflang class
https://sv.wikipedia.org/wiki/Gravitation Gravitation – Swedish sv sv interlanguage-link-target
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a
href title lang hreflang class
https://tl.wikipedia.org/wiki/Grabidad Grabidad – Tagalog tl tl interlanguage-link-target
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https://ta.wikipedia.org/wiki/%E0%AE%88%E0%AE%B0%E0%AF%8D%E0%AE%AA%E0%AF%8D%E0%AE%AA%E0%AF%81_%E0%AE%B5%E0%AE%BF%E0%AE%9A%E0%AF%88 ஈர்ப்பு விசை – Tamil ta ta interlanguage-link-target
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https://tt.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%B2%D0%B8%D1%82%D0%B0%D1%86%D0%B8%D1%8F Гравитация – Tatar tt tt interlanguage-link-target
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https://te.wikipedia.org/wiki/%E0%B0%97%E0%B1%81%E0%B0%B0%E0%B1%81%E0%B0%A4%E0%B1%8D%E0%B0%B5%E0%B0%BE%E0%B0%95%E0%B0%B0%E0%B1%8D%E0%B0%B7%E0%B0%A3 గురుత్వాకర్షణ – Telugu te te interlanguage-link-target
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https://th.wikipedia.org/wiki/%E0%B8%84%E0%B8%A7%E0%B8%B2%E0%B8%A1%E0%B9%82%E0%B8%99%E0%B9%89%E0%B8%A1%E0%B8%96%E0%B9%88%E0%B8%A7%E0%B8%87 ความโน้มถ่วง – Thai th th interlanguage-link-target
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https://chr.wikipedia.org/wiki/%E1%8E%A0%E1%8F%93%E1%8E%BE%E1%8F%8C%E1%8F%81%E1%8F%8D%E1%8E%A9 ᎠᏓᎾᏌᏁᏍᎩ – Cherokee chr chr interlanguage-link-target
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https://tr.wikipedia.org/wiki/K%C3%BCtle_%C3%A7ekimi Kütle çekimi – Turkish tr tr interlanguage-link-target
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https://uk.wikipedia.org/wiki/%D0%93%D1%80%D0%B0%D0%B2%D1%96%D1%82%D0%B0%D1%86%D1%96%D1%8F Гравітація – Ukrainian uk uk interlanguage-link-target
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https://ur.wikipedia.org/wiki/%D8%AB%D9%82%D8%A7%D9%84%D8%AA ثقالت – Urdu ur ur interlanguage-link-target
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https://vec.wikipedia.org/wiki/Gravit%C3%A0 Gravità – Venetian vec vec interlanguage-link-target
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https://vi.wikipedia.org/wiki/T%C6%B0%C6%A1ng_t%C3%A1c_h%E1%BA%A5p_d%E1%BA%ABn Tương tác hấp dẫn – Vietnamese vi vi interlanguage-link-target
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a
href title lang hreflang class
https://war.wikipedia.org/wiki/Hulog-bug-%C3%A1t Hulog-bug-át – Waray war war interlanguage-link-target
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class style
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html
local
a
href title lang hreflang class
https://wo.wikipedia.org/wiki/Dooley_%C3%B1oddi Dooley ñoddi – Wolof wo wo interlanguage-link-target
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class style
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local
a
href title lang hreflang class
https://wuu.wikipedia.org/wiki/%E5%BC%95%E5%8A%9B 引力 – Wu Chinese wuu wuu interlanguage-link-target
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class style
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local
a
href title lang hreflang class
https://yi.wikipedia.org/wiki/%D7%92%D7%A8%D7%90%D7%95%D7%95%D7%99%D7%98%D7%90%D7%A6%D7%99%D7%A2 גראוויטאציע – Yiddish yi yi interlanguage-link-target
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class style
interlanguage-link interwiki-yi display: none;
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local
a
href title lang hreflang class
https://zh-yue.wikipedia.org/wiki/%E8%90%AC%E6%9C%89%E5%BC%95%E5%8A%9B 萬有引力 – Cantonese zh-yue zh-yue interlanguage-link-target
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interlanguage-link interwiki-zh-yue display: none;
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local
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href title lang hreflang class
https://diq.wikipedia.org/wiki/Ant%C4%B1%C5%9F%C3%AA_erdi Antışê erdi – Zazaki diq diq interlanguage-link-target
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https://zh.wikipedia.org/wiki/%E5%BC%95%E5%8A%9B 引力 – Chinese zh zh interlanguage-link-target
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class
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https://kbp.wikipedia.org/wiki/%C6%89ama_h%C9%94m_%C9%96o%C5%8B_(gravitation) Ɖama hɔm ɖoŋ (gravitation) – Kabiye kbp kbp interlanguage-link-target
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html
local
button
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mw-interlanguage-selector mw-ui-button All languages (initial selection from common choices by you and others)
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local
ul
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a
href title class
https://www.wikidata.org/wiki/Special:EntityPage/Q11412#sitelinks-wikipedia Edit interlanguage links wbc-editpage
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class
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