quote:
That can't go toward proving that gravity was any way at all.
Yes we can - we can model the effects of gravity on biological lifeforms (there was a great documentary about this on the BBC a couple of years ago). lots of NASAs work looks at this because it's vital to long-term space exploration.
If the gravity on this planet had been different (weaker or stronger) at some stage then humans and other animals would have evolved in radically different ways. We would also see this in plants - For example, the roots grow toward gravity (positive gravitropism) and the shoots grow away from gravity (negative gravitropism). Since none of the bones we find from those times differ in that radical way then that clearly never happened.
Edited by CK, : Clarification
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