Quote:
Originally Posted by m1omg
Oh, and you assume that galaxy travelling aliens would bury their bodies under the Earth, provided they even have bodies in a normal sense at all.
Bones can remain, but structures will erode away very fast.
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You mean, all evidence of structures have disappeared before bones? You're mistaken. Besides, actual bone tissue is very seldom found; in the fossilization process bones and other organic materials are slowly replaced by minerals.
Aliens have probably some fancy materials we can't even begin to imagine of. If you want a true starfaring civilization, current materials just aren't enough. They have to be very strong and lightweight.
If humans disappear tomorrow, what will stay behind? What material remains intact for a very long period? Organics decay, as do iron; concrete and asphalt erode away. Something hard... and it has to be very common so that at least some survive until the future archaeologists uncover them... I know! Toilet seats!