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Question
Do you think that a planet would have to have land to support life, or may there be life on waterworlds?
I don’t know of any reason why land is necessary for a planet to be habitable. Liquid water, not dry land, is the requirement for life as we know it. Astrobiologists think that life began on our planet in the oceans or shallow seas, and it has flourished there for nearly four billion years, so surely the same thing is possible on worlds that are entirely covered with water. David Morrison
NAI Senior Scientist
March 27, 2008
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