(Zalena Bender)

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Across
  1. 2. rates. In other words, the universe is
  2. 3. star A red star is cooler than the?
  3. 6. Law Until the 1920s, many
  4. 9. the universe is expanding at faster and
  5. 10. Sky Observing the
  6. 11. explosion some 13.7 billion years ago.
  7. 15. unchanged if the Sun collapsed to become a black hole, the orbit of earth would
  8. 16. and suns.
  9. 17. believed that the Milky Way galaxy made
  10. 18. the entire universe
Down
  1. 1. There are three types of
  2. 3. versus surface temperature for stars.
  3. 4. outward.
  4. 5. Bang is a theory that our universe began with a
  5. 7. Holes Gravitation at the surface of a star increases when it collapses.
  6. 8. Careful measurements of distant galaxies tell us
  7. 12. that combine to make people, planets,
  8. 13. russell diagram is a graph of intrinsic
  9. 14. Matter What we think of as ordinary matter is made of protons, neutrons, and electrons that form