why there is no gravity in space? and if sun has gravitational force then why don't all the planet fall into sun????
We know that the gravitational force reduces with the inverse with the inverse of the square of the distance or F ~ 1/r2. Now, due to this, in outer space the magnitude of gravitational force is just too small, although here is some but the effect is feeble. This feeble effect is too small to effect anything and thus we get the impression of absence of gravity in outer space. This is also the reason why planets do not fall to the sun, the distances are just too large to make any significant changes.