In article , James G wrote:
One thing I have never seen addressed or maybe I missed it when there
was a big hub-bub about it, but...
How do they *know* these meteorites actually came from Mars?
Even if they have the right spectral and chemical composition, a rock
is a rock isn't it?
An article on the SNC meteorites - the group of "known" Mars-originating
meteorites - can be found at
http://scienceworld.wolfram.com/astr...eteorites.html
(They announced the identification of another one quite recently, IIRC -
we're up to about 30.
http://www.jpl.nasa.gov/snc/ has a list)
--
-Andrew Gray