Tappitss t1_j1p1e27 wrote
Reply to comment by Kozzinator in How do they know what the inside of the earth is made of, along with the internal temperatures? by Kozzinator
If you think that's cool, look up how they use spectroscopy to determine the composition of other stars and planets millions of lightyears away.
[deleted] t1_j1tjie0 wrote
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