This article was accepted into the corpus but its outbound wikilinks were never NER-processed — typical at the deepest BFS hop or when the run's entity cap was reached. No expansion funnel to show.
| Lunar meteorite | |
|---|---|
| Name | Lunar meteorite |
| Type | Achondrite |
| Parent body | Moon |
| Composition | Anorthositic, basaltic, noritic, breccia |
| Discovered | Various locations worldwide |
| Total known weight | ~>400 kg |
Lunar meteorite Lunar meteorites are meteorites ejected from the Moon that have been recovered on Earth and studied by scientists. They link the Moon to terrestrial collections through impacts associated with solar system dynamics and have been central to comparisons with samples from the Apollo program, Soviet Luna program, and lunar sample curation at institutions such as the Smithsonian Institution and the Natural History Museum, London. Research on these meteorites intersects work at agencies and missions including NASA, ESA, JAXA, and academic laboratories at universities like MIT, Caltech, University of Arizona, and Brown University.
Lunar meteorites are a subset of achondritic meteorites identified by mineralogy and isotopic signatures matching lunar rocks returned by the Apollo program and the Luna 16 through Luna 24 missions. Classification relies on comparisons with curated collections at the Johnson Space Center, spectral matches to remote sensing data from missions such as Clementine and Lunar Reconnaissance Orbiter, and concordance with geochemical datasets produced by researchers at institutions including USGS, Carnegie Institution for Science, and Max Planck Institute for Chemistry. Their study has implications for chronologies developed using isotopic systems from laboratories like Argonne National Laboratory and observatories involved in planetary sample analysis.
Lunar meteorites present several compositional groups: anorthositic highland breccias, basaltic mare basalts, noritic and troctolitic samples, and impact-melt breccias. Petrographic and geochemical classification employs oxygen isotopes, chromium isotopes, trace-element patterns, and mineral modes analyzed by groups at Caltech, University of Manchester, ETH Zurich, and University of Bern. Major minerals include plagioclase, pyroxene, olivine, ilmenite, and accessory phosphates; elemental abundances of titanium, thorium, potassium, uranium, and rare earth elements are compared with datasets from Apollo 11, Apollo 12, Apollo 15, and Apollo 17 samples. Chronometers using uranium–lead, argon–argon, and samarium–neodymium systems are routinely applied in laboratories such as Lawrence Berkeley National Laboratory and Scripps Institution of Oceanography.
Ejection models for lunar meteorites invoke hypervelocity impacts on the lunar surface by asteroids and comets within the main belt or near-Earth populations studied by observatories like Pan-STARRS, LINEAR, and the Minor Planet Center. Numerical simulations using N-body codes developed at institutions such as NASA Ames Research Center, JPL, and University of Pisa show that ejecta achieving lunar escape velocity can be delivered to Earth-crossing orbits influenced by resonances such as the 3:1 mean-motion resonance with Jupiter and secular resonances tied to Saturn. Cosmogenic nuclide analyses performed at Los Alamos National Laboratory and Queen's University Belfast constrain transit times and exposure ages, while modeling of impact cratering processes references studies of the Chicxulub crater, Tycho crater, and regolith gardening characterized by lunar reconnaissance studies.
Recoveries of lunar meteorites have occurred in deserts and Antarctica, with major finds catalogued by curatorial facilities like the Antarctic Search for Meteorites program and the Natural History Museum, Vienna. Notable recovery campaigns involve teams from the National Institute of Polar Research (Japan), ANSMET, and national museums including the Smithsonian Institution; Antarctic specimens such as those from Allan Hills and Larkman Nunatak have been pivotal. Provenance studies combine petrography, oxygen isotopes, and surface-exposure microtextures analyzed at centers such as Stanford University, University of Western Ontario, and Institut de Physique du Globe de Paris to correlate meteorites with specific lunar terrains imaged by SELENE (Kaguya), Chandrayaan-1, and Lunar Reconnaissance Orbiter.
Lunar meteorites expand understanding of lunar petrogenesis, magmatic evolution, and impact history, complementing returned samples from the Apollo program and Luna missions. They inform models of lunar crustal formation, mare volcanism, and the timing of bombardment episodes including the hypothesized Late Heavy Bombardment studied by researchers at University of Hawaii and Brown University. Applications include calibration of remote sensing instruments aboard missions such as Clementine, Lunar Reconnaissance Orbiter, and Kaguya; testing chronology methods used at laboratories like Geological Survey of Japan; and constraining volatile inventories relevant to exploration plans by agencies including NASA and CNSA.
Lunar meteorites have been found in over a dozen countries and in Antarctic icefields, with important specimens including the Allan Hills 81005 suite, the Dhofar finds from Oman recovered by teams including the University of New Mexico, and the NWA (Northwest Africa) series discovered by Moroccan and international teams. Collections are housed at institutions such as the Smithsonian Institution, Museo Nacional de Ciencias Naturales (Madrid), Natural History Museum, London, and university collections at University of Tokyo and University of New Mexico. Databases maintained by the Meteoritical Society and curated lists at Lunar and Planetary Institute document provenances, classifications, and peer-reviewed studies.
Legal and ethical issues surrounding lunar specimens involve national laws such as the Antarctic Treaty for Antarctic finds, export regulations of countries including Morocco and Saudi Arabia for desert finds, and international frameworks like the Outer Space Treaty administered by the United Nations Office for Outer Space Affairs. Commercial trade in lunar meteorites engages dealers, auction houses such as Sotheby's and Christie's, and collectors regulated by norms established by the Meteoritical Society and curatorial policies at institutions like the Smithsonian Institution; disputes over provenance and repatriation have involved legal entities and governmental ministries in countries of origin. Scientific sampling and curation protocols follow standards developed at facilities including the Johnson Space Center and the European Space Agency.
Category:Meteorites