ALH84001 is a Martian meteorite that was found in Allan Hills, Antarctica, in 1984. It made headlines in 1996, when it was announced that it could contain trace evidence of Martian life in the form of fossils of bacteria-like life forms. There has since been much debate about whether the structures in question are truly evidence of extraterrestrial life. Some believe that the microfossils resulted from contamination by earthly biofilms. How long was ALH84001 on Earth before it was discovered? Discuss

Source: The Free Dictionary

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