More recent missions to Mars have greatly improved our picture of the Martian
surface and the conditions on Mars today. Curiosity was launched on Nov 26,
2011 reaching Mars on Aug 5, 2012 (landing in
Gale crater).
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A tantalizing (but inconclusive) result was published in the 1990s. A
Martian meteorite was discovered on Earth in the Allan Hills of Antarctica.
Meteorite ALH 84001 was argued to bear evidence of past life on Mars:
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