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A comment on Seven earth-sized planets discovered circling a star 39 light years from Earth. Parent comment

Re:Seven earth-sized planets discovered circling a star 39 l... by nickff on Wednesday February 22, 2017 @01:54PM (#13708092)
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.
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Re:Seven earth-sized planets discovered circling a star 39 l... by RangerScience on Wednesday February 22, 2017 @02:02PM (#13708180)
Continues to be...? Outside of human action, what's the vector?
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Re:Seven earth-sized planets discovered circling a star 39 l... by nickff on Wednesday February 22, 2017 @02:05PM (#13708215)
My understanding is that it is mostly due to solar wind, meteorite impacts, and various other infrequent events.
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Re:Seven earth-sized planets discovered circling a star 39 l... by dekhn on Wednesday February 22, 2017 @02:47PM (#13708586)
https://en.wikipedia.org/wiki/Martian_meteorite
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Re:Seven earth-sized planets discovered circling a star 39 l... by colordrops on Wednesday February 22, 2017 @02:05PM (#13708218)
powerful meteor strikes spreading debris out of orbit.
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Re:Seven earth-sized planets discovered circling a star 39 l... by Symmetry on Wednesday February 22, 2017 @03:48PM (#13709003)
And the debris isn't heated enough to be sterilized.
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