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Science

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Astronomy

Explore the sky, the Solar System, stars, and galaxies. Learn how observations and physical models help us understand the universe.

10 lessons

Lessons

  1. 1

    Brightness and distance

    3 min

  2. 2

    Reading a stellar diagram

    3 min

  3. 3

    Evidence for black holes

    3 min

  4. 4

    Interpreting cosmological redshift

    3 min

  5. 5

    Gravity bends the path of light

    3 min

  6. 6

    Light from the early universe

    3 min

  7. 7

    Why astronomers infer dark matter

    3 min

  8. 8

    Expansion and dark energy

    3 min

  9. 9

    A habitable zone is not proof of life

    3 min

  10. 10

    What a survey can miss

    3 min