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How does gravity work?

I would love to know how gravity works on planets, and how moons revolve around other planets.
Question asked by: cman1146

Asked on: 30 Sep 2009

This is an interesting question.

According to Einstein and relativity, which transformed our understanding of the universe, it is all to do with spacetime itself.

Gravity is a reflection of the shape of space, so for instance a body that has a high mass literally affects the shape of space around it.

The classic demonstration in two dimensions is to imagine a rubber sheet, with a big heavy ballbearing placed in the middle. This depresses the rubber (representing space) and then if you roll a small ballbearing around the outside it will fall into the big one, representing gravitational pull.

By: knowitall
Replied at: 11 Oct 2009
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