2015年11月17日 星期二

When In Doubt, Listen to Carl Sagan

Oh the Places We Won't Go: Humans Will Settle Mars, and Nowhere Else, Lou Friedman "Humans will become a multi-planet species by making it to Mars, but no farther. That is, they will never travel beyond Mars." Keith's note: While...

from NASA Watch http://ift.tt/1YfX3Zt
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