Life to Mars

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Rick Nelson - 28 May 2005 02:31 GMT

I can see how it is easy to send material from Mars to Earth with
meteoric impacts. But how probable is it that material from Earth has
been ejected to Mars? And what is the probable tonnage during what ages?

Thanks,

Rick

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Henry Spencer - 28 May 2005 17:00 GMT

>I can see how it is easy to send material from Mars to Earth with
>meteoric impacts. But how probable is it that material from Earth has
>been ejected to Mars?

Unlikely in recent times. Earth's strong gravity and thick atmosphere
make it much more difficult for impacts to get rocks off Earth; probably
it was possible only in the early days of the solar system, when really
huge impacts were common.

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"Think outside the box -- the box isn't our friend." | Henry Spencer
-- George Herbert | henry@spsystems.net

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Space Forum / Shuttle / May 2005

Life to Mars