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Allan Hills 84001 (ALH84001 [1]) is a fragment of a Martian meteorite that was found in the Allan Hills in Antarctica on December 27, 1984, by a team of American meteorite hunters from the ANSMET project. Like other members of the shergottite–nakhlite–chassignite (SNC) group of meteorites, ALH84001 is thought to have originated on Mars ...
The Martian meteorite NWA 7034 (nicknamed "Black Beauty"), found in the Sahara desert during 2011, has ten times the water content of other Mars meteorites found on Earth. [2] The meteorite contains components as old as 4.42 ± 0.07 Ga (billion years), [ 25 ] and was heated during the Amazonian geologic period on Mars.
During the Apollo program, McKay provided geology training to the first men to walk on the Moon in the late 1960s. McKay was the first author of a scientific paper postulating past life on Mars on the basis of evidence in Martian meteorite ALH 84001, which had been found in Antarctica. [2]
ALH 84001 is an extraterrestrial example of an orthopyroxenite. It is an achondrite meteorite from Mars. Orthopyroxenite is an ultramafic and ultrabasic rock that is almost exclusively made from the mineral orthopyroxene, the orthorhombic version of pyroxene and a type of pyroxenite. It can have up to a few percent of olivine and clinopyroxene.
The Shergotty meteorite, a 4 kilograms (8.8 lb) Martian meteorite, fell on Earth on Shergotty, India on August 25, 1865, and was retrieved by witnesses almost immediately. [219] It is composed mostly of pyroxene and thought to have undergone preterrestrial aqueous alteration for several centuries. Certain features in its interior suggest ...
Yamato 000593 (or Y000593) is the second largest meteorite from Mars found on Earth. [2] [5] [6] Studies suggest the Martian meteorite was formed about 1.3 billion years ago from a lava flow on Mars. [7] An impact occurred on Mars about 11 million years ago [7] and ejected the meteorite from the Martian surface into space.
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In 1984, a meteorite called Allan Hills 84001, thought to be from Mars, was found in Antarctica. Twelve years later, an article by NASA scientist David S. McKay was published in the journal Science , proposing that the meteorite might contain evidence for microscopic fossils of Martian bacteria (later, a disputed interpretation).