Science crossword puzzle!

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Across
  1. 1. The moon is big and we can see the whole thing
  2. 5. Gravity holds the planet in ____
  3. 6. Your hemisphere is tilted away from the Sun
  4. 8. The moon is in between the Earth and Sun
  5. 10. The Earth in between the Sun and moon
  6. 11. People from earth can't see the moon
  7. 12. It holds galaxies and solar systems
  8. 14. An object is spinning/circling
  9. 15. An object is spinning around another object
Down
  1. 2. the youngest layers are on the top and the oldest are on the bottom
  2. 3. The name of the inner planets
  3. 4. The name of the outer planets
  4. 7. The layers of rock and also known as Law of Superposition
  5. 9. Your hemisphere is tilted towards the Sun
  6. 13. This man discovered gravity