January 12th, 2008, 08:54 PM
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Major
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Join Date: Apr 2004
Location: Atlanta, Georgia
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Re: OT: Gravity, Dark Energy, Universal expansion
That falls under the "no such inertial reference frame exists" clause, and the speed of gravity does matter for such systems. Technically the Sun is accelerating so no inertial reference frame has it perfectly at rest either, but the difference is small enough on the scale of the solar system that it hardly matters.
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