Several months ago I blogged on some research that suggested the earth wasn't so hostile to life over 4 billion years ago (It's usually thought that the earth was not habitable before 3.9 billion years ago). Now research suggests that the massive asteroid impacts of 4 billion years ago would NOT have wiped out life (as is usually thought). See the report from News Daily.
Since the first traces of life are 3.8 billion years old, this means that there was about 600 million years for life to originate and evolve into the ancient single-celled organisms we find.
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