Which statement best describes galaxies?

Billions of stars in the same region of the universe are called

According to the big bang theory, the universe began as an explosion and is still expanding. This theory is supported by observations that the stellar spectra of distant galaxies show a

In which list are celestial features correctly shown in order of increasing size?

Based on the red-shift data on galaxies, most astronomers infer that the universe is currently

The unit most used by astronomers to express the distances to other galaxies is

A light year is

The Milky Way galaxy is best described as

A star moving toward the Earth will have a spectrum containing

According to Hubbell's law more rapidly moving galaxies are now

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