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The first discovery of extraterrestrial life will almost certainly NOT be when it visits us, nor when we visit it. It won't be when we see ...
624,438 views
1 year ago
*OUTLINE:* 0:00 - Introduction 1:58 - Planet formation 7:08 - Plate tectonics 14:30 - Extinction events 18:41 - Biosphere 21:39 ...
1,998,674 views
1 month ago
