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meteorite of notable scientific interest / From Wikipedia, the free encyclopedia
The Murchison meteorite is one of the most studied meteorites due to its mass (>100 kg or 220 lb) and the fact that it was an observed fall. It fell in Australia in 1969 near Murchison, Victoria. It belongs to a group of meteorites rich in organic compounds.
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Murchison meteorite | |
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Type | Chondrite |
Class | Carbonaceous chondrite |
Group | CM2 |
Composition | 22.13% total iron, 12% water |
Shock stage | S1–2 |
Country | Australia |
Region | Victoria |
Coordinates | 36°37′S 145°12′E[1] |
Observed fall | Yes |
Fall date | 28 September 1969 |
TKW | 100 kg (220 lb) |
Pair of grains from the Murchison meteorite |
In January 2020, astronomers reported that the oldest material found on Earth to date is the silicon carbide particles from the Murchison meteorite, which have been determined to be 7 billion years old, about 2.5 billion years older than the 4.54-billion-year age of the Earth and the Solar System.[lower-alpha 1] The published study noted "dust lifetime estimates mainly rely on sophisticated theoretical models. These models, however, focus on the more common small dust grains and are based on assumptions with large uncertainties."[2]