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Doubt & Answer Explanation

Doubt

if earth is there in the space and no other planet is there (nothing is there) ,and suddunley sun is brought near earth ,the will the gravitational field starts acting instantaneously or it will take some time?

Answer Explanation

Scientists have theorized that there will be a time delay but this time delay will extremely small, smaller than the time delay caused by an electric field. Scientists suggest that the gravitational waves travel at a speed of 2x10¹⁰ c - though these claims are yet to be verified. I suggest that you read this article and gain more insight into the speed of gravity: http://metaresearch.org/cosmology/speed_of_gravity.asp

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