NWA 15915 met stone was discovered in 2023
Steve Jurvetson/CC by 2.0
Misfit metstones that do not fit well into known categories can be world relics like lost mercury that were destroyed early in the history of the solar system.
Most asteroids that fall on Earth as metstones can group together and have a common origin, along with many people who come from the larger asteroids, the Moon and Mars. However, about 0.2% of metstones are outliers, resisting proper classification.
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Source: www.newscientist.com