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If the Sun were to instantaneously disappear presumably we would still see its light for the 8 minutes it takes that light to reach us. But what about the gravitational effects of the Sun? Would the curvature of space-time induced by the Sun's mass instantly vanish and therefore the Earth would cease to feel a gravitational attraction? Or would be not feel that change in gravitation initially?Chris
Very good Question !!Watch this what would happen .....http://www.youtube.com/watch?v=T884m5_QzWMthis vdo shows light from distant star ..Well velocity of light and velocity of Gravitational Waves are same (constant )so, after Sun ceases to exist ...... the G waves would reach us (at same time as light ) I mean the distortion of space gets modified to no distortion state .. and after that planets revolving around the sun would loose there orbit .. and gets lost in space !! This effect will be after 8 minutes 24 seconds !!!
Bearing in mind that the Sun would not "disappear", just like that, the question is meaningless unless the method and timescale are both considered. There are many better theoretical scenarios to consider which investigate the relative propagation of electromagnetic and gravitational effects.I am not being grumpy - just realistic. It just isn't as simple as that.
go on then. I'm convinced. 
Wouldn't that involve quite a lot of energy transfer - to disturb the 'simple' experiment?