A collection of stars, dust, and gas bound together by gravity

Groups of closely grouped stars that are usually located along the spiral disk of a galaxy. The stars are grouped close together relative to surrounding stars

About one-third of all galaxies are simply massive blobs of stars. Many look like spheres, and others are more stretched out. This type of galaxy has a bright center and very little dust and gas

A very luminous, star-like object that generates energy at a high rate; Thought to be the most distant objects in the universe

Why do scientists study distant galaxies?

All of the following are shapes used to classify galaxies EXCEPT

Which one of the following statements is NOT true of quasars?

What type of galaxy is the Milky Way thought to be?

Most galaxies are classified by their

All of the following are major types of galaxies EXCEPT

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