Answers

2016-04-21T23:01:24+05:30
The Sun Exerts a force on the planets. this force keeps the planets in an orbit. If the force wouldn't have been there, the planets would have passed outside of the orbit. This force is called Centripetal force. It is like, u tie a thread to a stone, hold the other end and rotate it with your hand. the stone moves in a circular orbit. The same applies here
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2016-04-22T11:45:56+05:30
Because they revolve at their orbits with margin-able distance from each other.
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