Nature itself has quite possibly
already cross-contaminated other planets with microbes from Earth.
When an asteroid impacts something, it sheds surface material from a
planet at high velocity into space. It is very possible that
resilient organisms like the tardigrade can withstand the temperature
and pressure extremes, riding along on the Earth fragments as they
are launched at high velocity into space. Computer models suggest
that impact "ejecta" could travel to the planets and their
moons in our solar system, with places like Mars and our own moon
receiving the bulk of the ejecta. That doesn't excuse some of the
acts we have already committed, however...
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