Question

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.

Explanation:

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

Answer:

The universe is expanding.