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however, this boulder's journey was made in geologically recent times. Studies suggest that regolith development from micrometeorite impacts will erase tracks like these over time intervals of tens of millions of years. If rate estimates are accurate, this boulder track might not be older than 50-100 million years. Eventually its track will be erased completely. What might have caused the rock to roll so recently? Perhaps this boulder was sent on its way by ground-shaking caused by the violence of a nearby impact. Perhaps a direct hit by a small meteoroid did the job.
Look at the ones that cross over a small crater...they keep going in the same direction not a skip, not a change of course, not a stop because IT JUST FELL IN A HOLE???
Originally posted by 0bserver1
reply to post by Brainiac
But is it not that those big rocks on the moon have almost equal weight as small rocks here on earth, because of more gravitational pull?edit on 21/12/2010 by 0bserver1 because: (no reason given)
Well, mass is a measurement of how much matter is in an object; weight is a measurement of how hard gravity is pulling on that object. Your mass is the same wherever you are--on Earth, on the moon, floating in space--because the amount of stuff you're made of doesn't change.