Proof of HED meteorite origin is based on data from the Dawn probe which orbited Vesta in the asteroid belt for 10 months. Vesta is the source of the HED meteorites, which are about 6% of all the meteorites which fall to Earth. These meteorites have pyroxene, which is a mineral rich in iron and magnesium. This has been matched exactly to the mineral signatures on Vesta's surface captured by Dawn's instruments.
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