How We Proved Earth’s Alive
6:11–8:19 · 128s
Dan explains Carl Sagan’s clever move to turn Galileo’s instruments back toward Earth, detecting oxygen, methane, vegetation’s red edge, and radio signals—showing what signs of life look like from space.
6:11–8:19 · 128s
Dan explains Carl Sagan’s clever move to turn Galileo’s instruments back toward Earth, detecting oxygen, methane, vegetation’s red edge, and radio signals—showing what signs of life look like from space.
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