It has already been debated many times
whether or not life on Earth may have originated from somewhere else,
delivered through impact ejecta. Some believe that our universe might
be in a perpetual state of cross-contamination. Perhaps it could also
be seen as cross-pollination? We should expect that landing on an
alien world will involve some sharing of microbes, even if we make
every effort to sanitize the process. I always chuckle when I see
scifi movies with people returning from an excursion on an alien
planet, and then go through “decontamination” rooms before
boarding their ship. Why do we assume that our decontamination
process will work on all alien life? Plus, considering impact ejecta,
if there is any alien life out there in the cosmos, there's a chance
it might reach us on Earth someday, too! Maybe it already has?
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