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Galaxies and Their Sizes

Galaxies and their sizes_HERO AMNH/D. Finnin

Exhibition Text

We live in the Milky Way Galaxy, a disk-shaped galaxy roughly a hundred thousand light-years across and two thousand light-years thick.  The smallest dwarf galaxies are a few percent of that size. The largest galaxies, found at the centers of galaxy clusters, are more than ten times larger than the Milky Way.

For Educators

Topic: Astronomy

Subtopic: Galaxies

Keywords: Astrophysics, Size, Milky Way, Universe, Ratio and proportion

Audience: General