What is a Galaxy?

  • Exhibition Text

    • Galaxies are titanic swarms of tens of millions to trillions of stars, orbiting around their common center of gravity. They also contain interstellar gas and dust. Galaxies show a range of shapes that astronomers group into three basic classes: spiral, elliptical, and irregular.

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  • For Educators

    • Topic: Astronomy

      Subtopic: Galaxies

      Keywords: Astrophysics, Cosmic dust, Galaxies, Gases

      Audience: General

In This Section

Our Galactic Neighborhood

Our Galactic Neighborhood

The Local Group of galaxies contains a few dozen members, bound together by gravity. Of these, our Milky Way and the Andromeda Galaxy are the largest.