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.

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There is gravity in space but its magnitude is very low...or it is very weak... If there were no gravity in space, weather and communication satellites would not orbit Earth, Earth would not orbit the Sun, and the Sun would not orbit the center of the Milky Way..... indeed, everything would shoot off in a straight line, and chaos would rule. But there is gravity in space, and lots of it.....

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 There is gravity, but it is a weak force and you can't feel it. If you were in a ship in space, something would be acting on you gravitationally. But it's acting on you and the ship equally, so you don't sink to the floor.

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