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NASA's fab @OSIRISREx swings by tomorrow to steal some of Earth's momentum #EarthGravityAssist, so lets chat about sampling the Solar System 
Earth’s inventory of planetary materials consists of dust & meteorites that land on Earth, & specimens from sample return missions (SRMs).
The majority of the 50,000+ classified meteorites originate from the asteroid belt between Mars & Jupiter; a few from Vesta, the Moon & Mars
