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Compared to age of Galaxy, Life on this planet has been brief. Also, aren't something like 99.99% of all species extinct?
by njharman 11y ago
Compared to age of Galaxy, Life on this planet has been brief. Also, aren't something like 99.99% of all species extinct?
- vectorjohn 11y agoNot really, life on Earth has existed for about 26% of the age of the universe (about 3.5 billion years). And we have good reason to expect that life cannot arise before a certain time because we have to go through a cycle or two of supernovas ejecting useful elements into their surroundings. If you meant intelligent life, then nevermind :)