"Does all life on Earth share a common single-celled ancestor? If so, what is it called? "
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Question
I wan't to know something about aliens and UFOs they are: # latest UFO crashed # what are the possibilities of aliens existing
There is no evidence of any UFO ever having crashed or landed on Earth, so the answer to the first part of your question is zero. On your second question, there is no scientific way to estimate the probabilities of alien life or where it will be found. Most astrobiologists would guess than life is common throughout the universe. It is pretty hard to imagine that we are unique among the billions of planets even within our own galaxy. But as yet we have no evidence of this alien life. David Morrison
NAI Senior Scientist
July 31, 2007
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