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" ... All told, the chondrites are approximately 4.5-to-4.55 years old, while the achondrites display enormous variations. This is largely because the achondrites are suspected to belong to large parent bodies, and are produced when they themselves are impacted, kicking up debris. In fact, within the achondrites, there are two special groups: one that corresponds to meteorites with lunar origins (as confirmed by the sample returns from the Apollo program) and one that corresponds to meteorites with Martian origins (as confirmed by various Mars rovers). ... "
" ... The research team analyzed the iron composition of Earth’s interior and compared it to extraterrestrial bodies. What they found was that the composition of Earth was very similar to the composition of a specific type of meteorite, CI chondrites. ... "
" ... “The K-Pg meteorite fragment I found was compact and similar to carbonaceous chondrites which are certainly asteroidal in origin; there’s no reason to believe that comets are identical to this,” Frank Kyte, a geophysicist at the University of California, Los Angeles (UCLA), told me. If anything, Kyte says that comets contain lots of volatile ices, so they may have significantly less iridium than meteorites. ... "