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This article is from the Alien Visitors
FAQ, by CRAM: The Cyberspatial Reality Advancement Movement
ldetweil@csn.org with numerous contributions by others.
2.03: What do we really know about life elsewhere in the universe?
There has been much speculation about life elsewhere in the universe. Unless
UFO contactee and abductee reports are evidence of visitation by beings from
elsewhere in the universe, there is very little evidence.
Much of the speculation centres around something called tha Drake Equation.
This attempts to estimate the number of civilisations in the universe by
using a number of inprecise variables. The only planet where we have firm
evidence of there being civilisation is a place called Earth.
Evidence of planets around other star systems has relied upon complex
calculations based upon minute variations in the star's 'wobble' about its
axis. Recent improvements in imaging systems have improved the reliability
of these observations. It is likely that the smallest extra-solar planets
detected are two to three times the mass of Jupiter. There is no detailed
information on the structure or conditions on these planets. It is not
known if any of these planets could support life.
Many of the molecules believed to be essential to the formation of life have
been detected in interstellar space. Amino acids have been found in some
meteorites. These tend to be equal mixes of left and right handed forms,
which is more likely to be the result of a chemical rather than a biological
process.
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