Earth Science Crossword

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Across
  1. 3. Planet closest to the sun
  2. 5. 13.8 ______ years ago everything in the known universe was created
  3. 7. This pulled hydrogen and helium together
  4. 9. An example of this planet would be Venus
  5. 11. Surrounds a star, made of gases
  6. 12. Gas giant
  7. 13. Formation of solar system from nebula cloud
  8. 14. These form planets orbiting a star through accretion
Down
  1. 1. One of Jupiter's moons
  2. 2. Hubble's Law says they are moving away from each other
  3. 3. According to Einstein's Theory of General Relativity, when energy slows down this is created
  4. 4. One of the first elements to form
  5. 6. The beginning of a nebula
  6. 8. An example of this planet would be Neptune
  7. 10. Gravity clumps together and forms this