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"it is thought that this happened 6 times in earth's history... all living creatures were wiped out... only to begin again..." interesting. If true, doesn't th
by asah 5y ago
"it is thought that this happened 6 times in earth's history... all living creatures were wiped out... only to begin again..."
interesting. If true, doesn't this have implications for Sagan's Equation? i.e. if life is wiped out and it (somehow) starts again, that implies that any planet like Earth will develop complex life forms given enough time? (or am I missing something...)
- MarcScott 5y agoI would have thought that the estimated 6 impacts, if they were on this scale, all occurred before life began evolving on Earth. Such impacts apparently formed the Earth-Moon system and the oceans. https://en.wikipedia.org/wiki/Impact_event#Earth_impacts https://en.wikipedia.org/wiki/Impact_event#Earth_impacts