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Gravity is responsible for keeping what three things?

What is gravity?

What tow things can affect gravity?

The larger the object, what affect on gravity does this have

The force of gravity is called?

If we went up into space and went to a lager palnet what affect if any would that have on us?

Explain what the geocentric model is

Who put forward the Heliocetric model

What is the heliocentric model?

How do starts form