Astrology

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Across
  1. 2. True or false? A little matter is a lot of energy?
  2. 7. billions of years since big bang, rounded up.
  3. 8. process that forms stars
  4. 9. What explosion do you still hear when you turn on your radio?
  5. 10. Millions of years it took earth to form, rounded down.
  6. 11. What two planets in the solar system don't have moons?
  7. 13. Solid objects pulled together by gravity.
  8. 14. Why does the moon have more craters than the earth, no space?
  9. 15. Reason Universe is still expanding, no space.
Down
  1. 1. What isotope of Uranium is used to make an atomic bomb?
  2. 3. First two elements in space alphabetically, no space.
  3. 4. Solar nebula are generally made primarily with what element?
  4. 5. What two planets is the asteroid belt between (no space, alphabetical) ?
  5. 6. Collection of dust that formed into planets, no space
  6. 12. Why did solar nebula form as a disk?