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There has been and continues to be cross-contamination between Venus, Earth, and Mars, so it seems likely that planets much closer together, and passing each ot
by nickff 10y ago
There has been and continues to be cross-contamination between Venus, Earth, and Mars, so it seems likely that planets much closer together, and passing each other more frequently would have more 'communication' of materials.
- RangerScience 10y agoContinues to be...? Outside of human action, what's the vector?
- nickff 10y agoMy understanding is that it is mostly due to solar wind, meteorite impacts, and various other infrequent events.
- colordrops 10y agopowerful meteor strikes spreading debris out of orbit.
- Symmetry 10y agoAnd the debris isn't heated enough to be sterilized.
- dekhn 10y agohttps://en.wikipedia.org/wiki/Martian_meteorite https://en.wikipedia.org/wiki/Martian_meteorite