In the 1920s, Edwin Hubble looked at the spectra of stars from distant galaxies. To his surprise, he found that all of these spectra were red-shifted, and that the more distant the galaxy, the greater the red-shift. What is a reasonable conclusion from this evidence?
A. The universe is expanding.
B. The universe is contracting.
C. The universe is unchanging.
D. The universe is curved.
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In the 1920s, Edwin Hubble looked at the spectra of stars from distant galaxies. To his surprise, he...
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