Gravity is a fundamental force that exists between any two objects with mass, playing a crucial role in explaining the movement of celestial bodies in our solar system. In the classical view, the force of gravity is directly proportional to the mass of the objects and inversely proportional to the square of the distance between them. On Earth, the gravitational field is created by the mass of its matter, which attracts all objects toward the center of mass. 

However, Albert Einstein's General Theory of Relativity provides a more comprehensive understanding of gravity. In this theory, gravity is not considered a force but rather a consequence of the curvature of spacetime caused by the presence of mass and energy. Space and time are combined into a single four-dimensional continuum known as spacetime, which becomes curved in the presence of massive objects. Objects with mass follow the shortest paths, called geodesics, through this curved spacetime, resulting in the observed effects of gravity.

The General Theory of Relativity also incorporates the equivalence principle, which states that the effects of gravity are indistinguishable from those of acceleration. This means that an observer in a closed room would not be able to tell the difference between the sensation of being pulled toward the Earth due to gravity and the sensation of being in a room accelerating upwards at a constant rate equivalent to the force of gravity. This principle further supports the idea that gravity is not a force in the traditional sense, but rather the result of objects following geodesics in curved spacetime.

Flat-earthers do not have a convincing theory that accounts for the effects of gravity. Some flat-earthers propose that gravity is an inherent part of the universe that simply draws everything down - a theory that could be accepted by observation alone, if not for the vast body of scientific data we have about our planet and solar system. This is why the scientific method and trust are essential for interpreting the world. 

I understand your desire to convince flat-earthers that the Earth is a globe. It is important to remember, however, that most flat-earthers lack faith in commonly accepted notions, which is often a result of valid criticisms of our systems. In most cases, it is more effective to explore the reasons for their mistrust or to talk about other topics than those on which you disagree, and to demonstrate that you are not just a believer, but a person. People generally like to be around those who understand them, and they tend to seek out such people. This is not inherently bad, but it can lead to echo chambers where one hears only one perspective - an environment that can foster cult-like ideologies that are very difficult to escape. Your beliefs and knowledge have a profound impact on your life (family, friends, etc.), so leaving them behind can have a detrimental effect. Therefore, it is important to remember that for some flat-earthers, accepting the theory of gravity is not as simple as it seems.
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