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Question
What was it like on the earth at the formation of our planet? (what kind of life could have exsisted on earth).
Earth formed over a period of several million years. Shortly after it formed, Earth was disrupted by collision with a Mars-sized projectile, an event that ultimately gave rise to our Moon. Subsequently the crust solidified, but very high levels of both volcanic eruptions and meteor impacts continued for at least a hundred million years. During this time there is evidence that the Earth did have an ocean of liquid water, perhaps even saltier than its present ocean. Since the Sun was fainter than it is today, the ocean may have been ice-covered most of the time. Occasional strikes by very large meteors, however, could temporarily boil away most or all of the ocean. This very early Earth does not seem like a very hospitable place for life to start. David Morrison
NAI Senior Scientist
January 13, 2006
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