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The spectrum of an element, let's call it hubblium, has been observed in a laboratory on earth to look like this spectrum of hubblium seen in lab on earth (at rest) this hubblium is seen in the spectra of four galaxies, all redshifted. sort these galaxies by how fast they are moving away from us, from fast (at the top) to slow (at the bottom)
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The spectrum of an element, let's call it hubblium, has been observed in a laboratory on earth to lo...
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