Mathematics – Logic
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999msqp.work....4a&link_type=abstract
Mars Sample Quarantine Protocol Workshop, p. 4
Mathematics
Logic
Mars (Planet), Mars Atmosphere, Planetary Surfaces, Snc Meteorites, Mars Surface, Mars Sample Return Missions, Containment, Mars Surface Samples
Scientific paper
Twelve meteorites, with a total mass of 80 kg, are accepted as having come to Earth from the planet Mars. The meteorites are tied to a common parent body by the ratios of oxygen isotopes in their silicate minerals. These ratios are concordant as well as distinct from those of terrestrial and lunar rocks, and other meteorites. All twelve of the meteorites are igneous rocks, and eleven are geologically young, which indicates that they originated on a planet-sized body. Several of the meteorites contain trapped gas that closely match the composition of the martian atmosphere. Models of hypervelocity impacts on planetary surfaces indicate that a small percentage of the near-surface target material can be ejected into space. These data combine to provide extremely strong support for a martian origin of the meteorite suite. These unsterilized, random samples of Mars have been on Earth for at least 100,000 years and in contact with people for nearly 200 years. However, none of this obviates the statutory requirements for containment and testing of returned martian samples.
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