Space Crossword Puzzle

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Across
  1. 2. The Earth was formed 4.5 ______ years ago.
  2. 3. One of the first two elements created after the Big Bang was...
  3. 5. A body that can come together to make a planet
  4. 7. Who created the formula E=Mc²
  5. 12. What force makes things spin faster as something is pulled closer to the center
  6. 14. What star do the planets revolve around
  7. 15. What causes the nebula particles and gases to stick together?
  8. 16. The Solar nebula is formed from dust, ice and _____.
Down
  1. 1. energy is slowed down and transformed into...
  2. 4. Which planet in our solar system is the farthest away from the sun
  3. 6. once the center of a solar nebula gains so much mass it forms a ____.
  4. 8. The universe continues to...
  5. 9. What is considered the start of our universe?
  6. 10. Which planet in our solar system is the smallest
  7. 11. What planet is in between Earth and Mercury
  8. 13. The solar nebula forms the shape of a _______ disk.