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Re:Water on Mars: discovery of three buried lakes intrigues ... by Tepix on Monday September 28, 2020 @05:03PM (#24621190)
Rocks have been exchanged between solar system bodies for millenia. We know that life can theoretically survive on these meteors. So it seems rather unlikely that a foreign life form that is not well adopted to life on Earth has a big chance of survival.
Re:Water on Mars: discovery of three buried lakes intrigues ... by jula432vdf on Monday September 28, 2020 @11:56PM (#24624028)
we could have had already some encounters, maybe some current life-forms in Earth were actually alien-forms initially (somehow octopuses comes to mind).

Some people on the net says that the current coronavirus situation could be an alien-species. I know it is FAR FAR from anything related to what we already know about the virus.

But it gives an idea about what could have looked an encounter with a new alien-patogen which just landed on Earth at some point at history and got to survive and thrive in the local ecosystem.