in the 1920s, edwin hubble looked at the spectra of stars from distant galaxies. to his surprise, he found…

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? the universe is expanding. the universe is contracting. the universe is unchanging. the universe is curved.

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? the universe is expanding. the universe is contracting. the universe is unchanging. the universe is curved.

Answer

Brief Explanations:

Red - shift indicates galaxies moving apart. More distant, greater shift means universe expanding.

Answer:

The universe is expanding.