ALH84001 is the designation of a meteorite fragmented, generally regarded as originating on Mars. It was discovered in December 1984 in Antarctica by a meteorite-search expedition of the ANSMET program, as one of 7000 others. On discovery, its weight was 1.93 kg. According to NASA, it was formed on Mars from molten lava about 4 billion years ago, then came to earth as another meteorite impacted on Mars, throwing ALH84001 off Mars' surface as debris, about 15 million years ago. Roughly 13,000 years ago, ALH84001 impacted on earth.
See also: Martian meteorite
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