Assertion: terrestrial planet's core | /r/SimilarTo | the iron meteorites
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text: This means that whatever the core is made of can't be rare stuff like gadolinium or ruthenium, but must be common stuff like iron (one of the most abundant metals in the Universe), which agrees with the evidence from meteorites, and allows us to more or less confidently say that the core must be "just like" the iron meteorites.