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Daemon
Posted: Monday, October 7, 2019 12:00:00 AM
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ALH84001

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? More...
KSPavan
Posted: Monday, October 7, 2019 2:53:48 AM

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ALH84001
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.
Adyl Mouhei
Posted: Monday, October 7, 2019 4:58:06 AM

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Location: Casablanca, Grand Casablanca, Morocco
ALH 84001 is a meteorite, a rock that fell to Earth from space. It was found in December 1984 in Antarctica by a U.S. meteorite-hunting expedition. When it was found, ALH 84001 weighed about 4 and 3/4 pounds (1.93 kilograms). It was shaped like a rounded brick or a large potato, about 6 inches long by 4 inches by 3 inches, and was partly covered with black glass (like it was dipped in tar). The glass, called fusion crust, forms on all meteorites when they burn through the Earth’s atmosphere. ALH 84001 looked green inside, which really excited the expedition. But back at civilization, ALH 84001 looks much grayer inside than green.
ALH 84001 formed originally from molten lava, about 4.5 billion years ago, which is called its igneous age, possibly from an ancient martian volcano. To a geologist, ALH 84001 is an igneous rock, similar to many that crystallized from lava inside the Earth. ALH 84001 is also similar to an important group of igneous meteorites (the diogenites) and was classified as one of them until 1994 when its martian origin recognized by Mittlefehldt (1994).

Long after ALH 84001 crystallized from molten lava and cooled, about 4.0 billion years ago, it was heated again and deformed by a strong shock. This heating and shock were probably from the nearby impact of an asteroid or meteorite. Some time after this impact, possibly about 3.6 billion years ago, some kind of liquid flowed through ALH 84001 and deposited rounded globules of carbonate minerals. The possible martian fossils are in these carbonate globules. The only more recent event that we can see in ALH 84001 is another shock event. This shock may have come from the meteorite impact that lofted ALH 84001 off Mars. For a blow-by-blow description of ALH 84001’s geological history, see Treiman (1995).
Wilmar (USA)
Posted: Monday, October 7, 2019 1:30:17 PM

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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.

Never heard of it.
ChristopherJohnson
Posted: Tuesday, October 8, 2019 1:58:45 AM

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Location: Tbilisi, T'bilisi, Georgia
I am 95+ per cent sure that these formations have biological origin.
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