A Martian meteorite recently found on Earth may represent a missing link between Mars' warm, wet past and its present cold and dry state, a new study shows. The meteorite — named NWA 7034 — is markedly dissimilar from other meteorites from Mars that scientists have studied on Earth. NWA 7034 has about 10 times more water content (about 6,000 parts per million) than any of the 110 other known meteorites that have fallen to Earth from Mars, suggesting that the meteorite probably came from the Martian surface, as opposed to deeper inside, said University of New Mexico planetary scientist...