Astronomy and Microscopic Physics

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Across
  1. 3. We can see some of our own galaxy.
  2. 4. If it is big and goes around a sun, it is a:
  3. 7. If it goes around a planet it is a
  4. 9. What may have a hundred billion stars in it?
  5. 11. Anything orbiting anything is a
  6. 12. 2 hydrogen atoms and 1 oxygen atom
  7. 14. Which did not form in the same general way
  8. 15. By volume the universe is mostly:
  9. 16. in orbits like planets Asteroids are
  10. 18. Can fire have a shadow
Down
  1. 1. solar system may include several galaxies
  2. 2. Which is a few light hours across?
  3. 3. A Big Bang universe may also imply a Big Crunch
  4. 5. solid object orbiting a sun An asteroid is a
  5. 6. My name
  6. 8. The solar system is mostly full of
  7. 10. Suns and stars are the same thing
  8. 13. Which are (is) a few light years away from us
  9. 17. My teachers calls himself