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From Wikipedia, article "Martian meteorite": These meteorites are thought to be from Mars because they have elemental and isotopic compositions that are similar to rocks and atmosphere gases analyzed by spacecraft on Mars.
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What is the difference between the meteorites from earth and from mars?
Basic Answer:Detailed chemical analysis distinguishes the various type of meteorites and can easily tell the difference between the meteorites found on Earth that originated during the formation of the solar system and those found on Earth which are from Mars. Of the 60,000 known meteorites found on Earth, just over 100 originated on Mars.More Details:We need to get the language right to begin with.Mars Meteorite:If we say a meteorite is from Mars, we mean it actually was part of Mars and was ejected into space by a comet or asteroid collision with Mars. There are just over a hundred Martian Meteorites found on Earth. (The most famous meteorite from Mars is the Allan Hills 84001 found in Antarctica in 1984 and evaluated in 1995 as possibly having fossilized microbes, i.e. evidence of life on Mars. ) A meteorite which is found on Mars is not a Mars Meteorite.Earth Meteorite:Similarly, if we say a meteorite is from Earth, we mean it actually was part of Earth and was ejected into space somehow. These surely exist since there have been major collisions between Earth and large asteroids in the past. We even know that certain special minerals are produced in such collisions. Billions of tiny pieces of these special minerals as well as other rocks have been ejected into space and fallen back to Earth. Even so, we don't call them meteorites since they probably just went up and then down in a short time. Meteorites really need to come in a space rocks colliding with Earth and no such object has ever been identified that was, billions of years ago, part of Earth. So, basically, there are no Meteorites from Earth that have been discovered.Distinctions:The way that a meteorite is determined to have started off on a planet is by chemical analysis, isotopic analysis and by radiometric dating. One can look this up and learn there are very specific groups of meteorites and very well characterized chemical signatures. All planet originated meteorites are in the subgroup SNC (Shergottite, Nakhlite, or Chassignite) of the type Achondrite. Further, these are rarely over a billion years old.
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