Galaxy Fundamentals

How big are galaxies?

Galaxies range greatly in size and mass. The smallest galaxies contain perhaps ten to one hundred million stars, whereas the largest galaxies contain trillions of stars.

There are many more small galaxies than large ones. The Milky Way, which has at least one hundred billion stars, is on the large end of the scale; its disk is about 100,000 light-years across.


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