Wednesday, August 14, 2019

Alien life from Earth? (part 3)


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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