Evolution of the Universe

  • About

    • Galaxies form and evolve within an expanding and cooling universe. Because light takes billions of years to cross the cosmos, we see distant galaxies as they were at earlier times. Astronomers not only theorize about cosmic evolution - they can actually observe its various stages.

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  • For Educators

    • Topic: Astronomy

      Subtopic: Galaxies

      Keywords: Universe, Galaxies, Expanding Universe, Cosmology

      Audience: General