Astronomy:Allan Hills 77005

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Allan Hills 77005
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Meteorite ALH-77005
TypeAchondrite (unique)[1][2]
ClanMartian meteorite
Composition~55% olivine, ~35% pyroxene, ~8% maskelynite and ~2% opaques[3]
Shock stageS6[4]
Weathering gradeA[1]
CountryAntarctica
RegionAllan Hills
Coordinates [ ⚑ ] : 76°43′00″S 159°40′00″E / 76.7166667°S 159.6666667°E / -76.7166667; 159.6666667[1]
Observed fallNo[1]
Found date29 December 1977 (Japanese National Institute of Polar Research mission)[5][6]
TKW482.5 g[1]

Allan Hills 77005 (also known as Allan Hills A77005, ALHA77005, ALH77005 and ALH-77005[1][5]) is a Martian meteorite that was found in the Allan Hills of Antarctica in 1977 by a Japanese National Institute of Polar Research mission team[7] and ANSMET.[8] Like other members of the group of SNCs (shergottite, nakhlite, chassignite), ALH-77005 is thought to be from Mars.[9]

Description

On discovery, the mass of ALH-77005 was 482.5 g (1.064 lb). Initial geological examination determined that the meteorite was composed of ~55% olivine, ~35% pyroxene, ~8% maskelynite and ~2% opaques.[3]

In March 2019, researchers reported the possibility of biosignatures in this Martian meteorite based on its microtexture and morphology as detected with optical microscopy and FTIR-ATR microscopy, and on the detection of mineralized organic compounds,[5][7][10] suggesting that microbial life could have existed on the planet Mars.[7] More broadly, and as a result of their studies, the researchers suggest Solar System materials should be carefully studied to determine whether there may be signs of microbial forms within other space rocks as well.[7]

See also


References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Staff (31 March 2019). "Meteoritical Bulletin Database: Allan Hills 77005". Meteoritical Bulletin Database. https://www.lpi.usra.edu/meteor/metbull.php?sea=alh+77005&sfor=names&ants=&nwas=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&strewn=&snew=0&pnt=Normal%20table&code=1321. 
  2. ↑ McSween Jr, Harry Y. (1 November 1979). "Petrogenetic relationship between Allan Hills 77005 and other achondrites". Earth and Planetary Science Letters 45 (2): 275–284. doi:10.1016/0012-821X(79)90129-8. Bibcode: 1979E&PSL..45..275M. 
  3. ↑ 3.0 3.1 Meyer, C - Martian Meteorite Compendium (2012). "ALH77005 - 482grams - Intermediate Lherzolitic Shergottite". NASA. https://curator.jsc.nasa.gov/antmet/mmc/alh77005.pdf. 
  4. ↑ Allan Hills A77005. The Meteoritical Society. Accessed on April 8, 2019. Quote: The meteorite has been severely shocked, as is shown by the presence of maskelynite, undulose extinction in the pyroxene, and occasional areas of apparent shock melting.
  5. ↑ 5.0 5.1 5.2 Gyollai, Ildikó (29 March 2019). "Mineralized biosignatures in ALH-77005 Shergottite - Clues to Martian Life?". Open Astronomy 28 (1): 32–39. doi:10.1515/astro-2019-0002. Bibcode: 2019OAst...28...32G. 
  6. ↑ Baalke, Ron. "The ALHA 77005 Meteorite". NASA. https://www2.jpl.nasa.gov/snc/alha.html. 
  7. ↑ 7.0 7.1 7.2 7.3 De Gruyter (4 April 2019). "Life on Mars? - A Martian meteorite discovered 40 years ago delivers fresh evidence that life once existed on Mars". EurekAlert!. https://www.eurekalert.org/pub_releases/2019-04/dg-lom040419.php. 
  8. ↑ Cassidy, William (2003). Meteorites, Ice, and Antarctica: A personal account. Cambridge: Cambridge University Press. pp. 28-29,115,335-337. ISBN 9780521258722. https://archive.org/details/meteoritesiceant00waca. 
  9. ↑ Anderson, Paul Scott (7 April 2019). "New evidence for life in a Martian meteorite? - The discovery of fossilized microbes in Martian meteorites has been claimed before. Now scientists in Hungary add a new study of the ALH-77005 meteorite, with some intriguing new evidence.". Earth & Sky. https://earthsky.org/space/evidence-fossil-life-martian-meteorite-alh-77005. 
  10. ↑ De Gruyter (4 April 2019). "Life on Mars?". Phys.org. https://phys.org/news/2019-04-life-mars.html. 

Further reading

External links




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