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. However, it does not fit into any of the previously discovered SNC groups. Its mass upon discovery was 1.93 kilograms (4.3 lb).
In 1996, a group of scientists found features in the likeness of microscopic fossils of bacteria in the meteorite, suggesting that these organisms also originated on Mars. The claims immediately made headlines worldwide, culminating in U.S. president Bill Clinton giving a speech about the potential discovery.[2] These claims were controversial from the beginning, and the wider scientific community ultimately rejected the hypothesis once all the unusual features in the meteorite had been explained without requiring life to be present. Despite there being no convincing evidence of Martian life, the initial paper and the enormous scientific and public attention caused by it are considered turning points in the history of the developing science of astrobiology.[3]
^ abc"Meteoritical Bulletin Database: Allan Hills 84001".
^"President Clinton Statement Regarding Mars Meteorite Discovery". www2.jpl.nasa.gov. Retrieved 17 March 2018.
^Cite error: The named reference disbelief was invoked but never defined (see the help page).
AllanHills84001 (ALH84001) is a fragment of a Martian meteorite that was found in the AllanHills in Antarctica on December 27, 1984, by a team of American...
collected in 1977 at AllanHills, while ALH 84001 was collected on the AllanHills Far Western Icefield during the 1984–85 season. ALH 84001, arguably the most...
may be signs of microbial forms within other space rocks as well. AllanHills84001 Glossary of meteoritics History of Mars observation Life on Mars List...
AllanHills A81005 or ALH A81005 (sometimes also named without the "A" in front of the number) was the first lunar meteorite found on Earth. It was found...
chondrite (Chihuahua, Mexico, 1969). AllanHills A81005 – First meteorite determined to be of lunar origin. AllanHills84001 – Mars meteorite that was claimed...
(3), and ones otherwise (15) (containing the orthopyroxenite (OPX) AllanHills84001, as well as 10 basaltic breccia meteorites). Consequently, Martian...
One of the oldest Martian meteorites found on Earth, AllanHills84001, discovered in the AllanHills of Antarctica, has been reported to have crystallized...
from the original on 9 August 2023. Retrieved 4 January 2023. Ashworth, Allan C.; Erwin, Terry L. (2016). "Antarctotrechus balli sp. n. (Carabidae, Trechini):...
kilograms (4.3 lb) AllanHills84001 meteorite, commonly abbreviated as ALH 84001 and believed to be from Mars, was found at AllanHills, Antarctica in 1984...
Eiler, John M. (2011-10-11). "Carbonates in the Martian meteorite AllanHills84001 formed at 18 ± 4 °C in a near-surface aqueous environment". Proceedings...
"Origin of supposedly biogenic magnetite in the Martian meteorite AllanHills84001". Proceedings of the National Academy of Sciences. 99 (10): 6556–6561...
from a variety of meteorite locations around the world including the AllanHills84001 meteorite of Antarctica. It has also been reported from a slag occurrence...
of extraterrestrial life has been identified. Examination of the AllanHills84001 meteorite, which was recovered in Antarctica in 1984 and originated...
world-record time of 19.32 seconds. August 6 – NASA announces that the AllanHills84001 meteorite, thought to originate from Mars, may contain evidence of...
McSween HY (2019), "The Search for Biosignatures in Martian Meteorite AllanHills84001", in Cavalazzi B, Westall F (eds.), Biosignatures for Astrobiology...
meteorites. ALH – an abbreviation used for meteorites from AllanHills. AllanHills84001 – is an exotic meteorite from Mars that does not fit into any...
1996 Summer Olympics conclude. August 6 – NASA announces that the AllanHills84001 meteorite, thought to originate from Mars, may contain evidence of...
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