03-27-2011, 02:22 PM
(03-27-2011, 03:27 AM)Xplosiw Wrote: There was a document about us humans leaving this planet, and what would happen. It was about 15000 years and there would be no traces of us anymore. Expect Mount Rushmore.And plastic. Which document was this? Presumably, anything that sufficiently shields from weathering and erosion effects would preserve a great deal of our artifacts much longer than 15000 years.