Cosmology and Relativity
My other main interest in life is cosmology and relativity (the two go hand-in-hand).
I noticed something in [gammadon]'s "The Theory of Everything" journal, quite some time ago (June 2005) where he asked a question regarding this quote from pages 72-73 of Brian Greene's "The Elegant Universe"...
"In fact, the mathematics of general relativity shows that in the case of a relatively slow moving body like the earth revolving around a typical star like the sun, the warping of time actually has a far more significant impact on the earth's motion than does the warping of space."
I posted this reply, which I thought might interest other engineers:
"My understanding of the effect: Newton's gravity is directly modified by the curvature of time (g_00 in the Schwarzschild metric). The curvature of space (g_11 etc) adds to g_00, but gets "diluted" by a factor v^2/c^2. So for most planets, where v << c, the effect is negligible."
Any comments welcome.
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