There is one theory that explains the
apparent absence of alien life out there in the universe, but this
theory is based on our assumptions about what is necessary for life
to exist. The theory states that, considering the volatile process a
planet must undergo in order for it to become habitable, it is
unlikely that microbes and other lifeforms could have existed long
enough—or be plentiful enough—that they could help balance the
process. Life on a planet actually regulates
greenhouse gases such as water and carbon dioxide, but without it,
surface temperatures would be too volatile to support life for very
long because most early planetary environments are unstable. Sudden
and erratic heating and cooling on young planets would make it
difficult for early life to survive and flourish. This
delicate window of time is just one of the many factors that makes
life on another planet very, very unlikely, even if they have
habitable environments. If we operate with this understanding, then
we narrow our search options by our assumptions. A xeno-biologist,
however, may shatter that paradigm...
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