<P> Uranus is the seventh planet of the Solar System ; it has 27 known moons , all of which are named after characters from the works of William Shakespeare and Alexander Pope . Uranus 's moons are divided into three groups : thirteen inner moons , five major moons , and nine irregular moons . The inner moons are small dark bodies that share common properties and origins with Uranus 's rings . The five major moons are massive enough to have reached hydrostatic equilibrium , and four of them show signs of internally driven processes such as canyon formation and volcanism on their surfaces . The largest of these five , Titania , is 1,578 km in diameter and the eighth - largest moon in the Solar System , and about one - twentieth the mass the Earth 's Moon . The orbits of the regular moons are nearly coplanar with Uranus 's equator , which is tilted 97.77 ° to its orbit . Uranus 's irregular moons have elliptical and strongly inclined ( mostly retrograde ) orbits at large distances from the planet . </P>
<P> Uranus is the seventh planet of the Solar System ; it has 27 known moons , all of which are named after characters from the works of William Shakespeare and Alexander Pope . Uranus 's moons are divided into three groups : thirteen inner moons , five major moons , and nine irregular moons . The inner moons are small dark bodies that share common properties and origins with Uranus 's rings . The five major moons are massive enough to have reached hydrostatic equilibrium , and four of them show signs of internally driven processes such as canyon formation and volcanism on their surfaces . The largest of these five , Titania , is 1,578 km in diameter and the eighth - largest moon in the Solar System , and about one - twentieth the mass the Earth 's Moon . The orbits of the regular moons are nearly coplanar with Uranus 's equator , which is tilted 97.77 ° to its orbit . Uranus 's irregular moons have elliptical and strongly inclined ( mostly retrograde ) orbits at large distances from the planet . </P>
what is the number of moons on uranus
what is the number of moons on uranus
27 known
27 known