Actually, if gravity is instantaneous, then you would percieve the sun as moving away from the earth instantaneously after it vanished due to the earth moving quickly out of orbit. The earth would fling off in a straight line from the sun as soon as it vanished at incredible speed, and the light from where the sun WAS would take longer to reach the earth as the earth moves away. From earth's perspective, it would be as if the sun were moving away from the earth at incredible speed instead (relativity). However, since gravity has supposedly been measured as being affected at the speed of light, then you would notice no change at all until 8 minutes after the sun was gone.
The argument itself is moot b/c it's impossible for a mass such as the sun to simply vanish & since gravity is influenced by mass and mass can only move at sub-light speeds, it would be impossible for any change in the sun to be noticed gravitationally by any object at any speed faster than light.:-)
Ahhh... Physics rocks... lol. No wait, that's geology.;-)
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The argument itself is moot b/c it's impossible for a mass such as the sun to simply vanish & since gravity is influenced by mass and mass can only move at sub-light speeds, it would be impossible for any change in the sun to be noticed gravitationally by any object at any speed faster than light. :-)
Ahhh... Physics rocks... lol. No wait, that's geology. ;-)