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Astronomers infer that the universe is expanding because distant galaxies all appear to?
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Astronomers infer that the universe is expanding because distant galaxies all appear to?

User Lauda Wang
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22 votes

Answer:

They appear to recede from our viewpoint.

That is, their emitted spectra are shifted toward the red (red-shift).

The wave-lengths that are received on earth are somewhat longer because of the "Doppler" shift of the receding atoms.

User Zero Piraeus
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