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Meteorites from Earth
By corg, Section Ask SciScoop Posted on Thu Feb 09, 2006 at 09:42:48 AM PST
I was reading on the BBC about another meteorite from Mars, and it got me wondering - have there been any rocks found that are thought to have originally come from Earth itself?

Do the orbital mechanics of it make this an extremely unlikely event? Anything found on Earth that we think came from the Moon, perhaps?

Meteorites from Earth | 9 comments (9 topical, 0 hidden)

Intraterrestrial Meteorites (none / 0) (#1)
by sciencebase on Wed Feb 08, 2006 at 10:52:52 PM PST

Interesting question, but I think the concept of a meteorite originating on earth is an oxymoron. By definition a meteorite is "a small extraterrestrial body that hits the Earth's surface."

So, not sure how those earth-bound rocks would have gone ET to then be captured once more by earth's gravity. Maybe AP has some ideas on this...

The Moon by chad, 02/09/2006 04:01:30 AM PST (none / 0)

Moon Rocks on Mars by sciencebase, 02/09/2006 06:41:27 AM PST (none / 0)

Re: Atmosphere burn by SvenErik, 02/09/2006 09:49:18 AM PST (none / 0)

O2 by sciencebase, 02/09/2006 12:56:54 PM PST (none / 0)

escape velocity (none / 0) (#6)
by Sweetwind on Fri Feb 10, 2006 at 09:26:33 AM PST

My guess would be that the surface escape velocity of the source planet is the most important factor. Since Earth is denser than Mars in addition to being much more massive, any rocks being thrown up from the surface are less likely to have enough velocity to escape into space.

Escaping Meteorites by sciencebase, 02/10/2006 09:31:07 AM PST (none / 0)
escape velocity not a factor by SEWilco, 02/12/2006 01:41:02 PM PST (none / 0)

Meteorites from Earth (none / 0) (#9)
by komatik on Mon Feb 20, 2006 at 12:11:33 PM PST

See the following abstract by Melosh and Tonks
HREF http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1993Metic..28Q.398M&db_key=AST&data_ type=HTML&format=

Meteorites from Earth | 9 comments (9 topical, 0 hidden)

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