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Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
No one has measured the speed of gravity and the indirect evidence that exists depends on general relativity being correct to give a valid answer. There are other theories where the speed of gravity is infinite or a lot higher than the speed of light.
Until someone finds ut an extremely clever way to measure it, it seems fairly safe to assume gravity propagates at the speed of light.
The question is problematic because the sun can't suddenly disappear. If we assume it does anyway we may think up a result that is invalid because the conditions are invalid.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
I think this is a very interesting question with the answer far from being obvious or meaningless. For a start have a look at (Well, is there any Physics question Beaz is not a good start for?), and then there are a few papers in respected journals speculating about the "Speed of Gravity".
Registered Member #158
Joined: Sun Feb 12 2006, 09:53PM
Location: Central Ohio
Posts: 282
Bjørn Bæverfjord wrote ...
No one has measured the speed of gravity and the indirect evidence that exists depends on general relativity being correct to give a valid answer. There are other theories where the speed of gravity is infinite or a lot higher than the speed of light.
Until someone finds ut an extremely clever way to measure it, it seems fairly safe to assume gravity propagates at the speed of light.
The question is problematic because the sun can't suddenly disappear. If we assume it does anyway we may think up a result that is invalid because the conditions are invalid.
That is my answer exactly ^
I always wondered about the 'speed' of gravity myself although I never researched it seriously. Is the whole concept of what gravity is still just a concept? For example has there ever been proof that a 'graviton' particle exists... or is it energy?
It is relatively impossible to make any mass instantly dissapear (unless you happen to have a lot of antimatter handy). I assume the point your trying to make/ask is about the speed in which the effect of gravity propagates.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Haha, good point Bjoern, the sun is already self-destructing as fast as the laws of physics allow How do you blow up something that's a nuclear fireball to start with?
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Interesting question . . .
How do you blow up something that's a nuclear fireball to start with?