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Craig
An interesting question. My "biologist's"point of view (ie: I have a mere passing knowledge of subjects like GR and SR) is that gravity should propagate at the speed of light. But wouldn't that be interesting if gravity's effects were instantaneous at any distance? I wonder how that would change the way things work. Or if!
Man we've got some cool experiments happening over the next period of years, gravity wave detectors, SKA, LHC, planet hunting Kepler and many more. I can't wait to see how these things advance our understanding of the Universe.
Enjoy reading your Christmas present. I received "Death from the Skies" by Phil Plait and The Grand Design by a Mr Hawking. Also "One Small Step" on the history of space exploration.
Stuart
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