(Zalena Bender)

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