Alone in the universe
Name: Betty A Laliberte
Do you believe extraterrestrial life forms exist and why do you believe
Actually, sometimes I am certain they must exist, and sometimes I am certain
they do not. The evidence that they do not exist is that if they did, we
would probably have seen them do something or communicate with us by now
(UFO's are not believable because the things UFO's do are simply not logical
things one would expect intelligent aliens to do). But maybe they do exist
and they know about us and they are deliberately ignoring us, or leaving us
alone to figure things out for ourselves.
The big question is, we do not know how likely it is for life to begin.
Simple arguments suggest that it is astronomically unlikely, so there could
be only one planet in the visible universe with life on it (ours). Other
arguments suggest that life began in simple stages that led very naturally
to the later complex life forms (the very early algae on Earth) and that
life might arise separately in many different places. We do know (or think
we know) that life started only once on earth, which already makes it more
probable that life is generally rare in the universe. It is possible that
life began somewhere else and "seeded" the earth a few billion years ago -
life started here remarkably soon after the Earth was ready for it!
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Update: June 2012