Pjams on 23 June 2012
| superchunk said: I really want to know how in the world they know a meteorite came from a specific planet? We've yet to return from Mars with actual soil samples, so how do they know with any certainty that its from Mars? |
This is pretty basic but informative
http://www.lifeinuniverse.org/MMorigin-06-01-06-03.html







