Gravity Lesson

Gravity is a force of attraction.

The closer two objects, the more gravitational pull between them.

​Einstein's theory of gravity, known as "general relativity," proposes that gravity is not a force, but rather a curvature of spacetime caused by the presence of mass and energy, meaning massive objects like stars and planets warp the fabric of spacetime around them, causing smaller objects to follow curved paths, which we perceive as gravity; essentially, "matter tells spacetime how to curve, and curved spacetime tells matter how to move.

All of those three examples in the picture have more or less the same diameter in space-time, yet vastly different wells/gravitational pulls.

The diameter on the surface is what matters, because this is where we live - like having a deep water well in your outdoor garden. Anything beyond the surface diameter won't be affected much, just like you can run around the garden and not fall into the well.

Stay away from the well, and you will be fine.

A caveat here is that gravity is a forever reaching effect.

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