The heating definitely starts out as direct collisions between the
meteoroid and the air. At some point, gas-gas collisions are likely
to predominate, but I'd like to see some kind of support for that
idea.

-- Jeff, in Minneapolis

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http://www.FreeMars.org/jeff/

"The other planets?
Well, they just happen to be there, but the point of rockets is to explore them!"
-- Kai Yeves