Worlds of David Darling
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Lithopanspermia is a version of the panspermia hypothesis in which it is argued that microscopic life can be conveyed from one world to another inside meteorites. It attracted the support of several eminent scientists in the 19th century, including William Thomson (Lord Kelvin) and Hermann von Helmholtz, and has recently been revived in the guise of ballistic panspermia.

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