Science crossword puzzle!

1234567891011121314151617
Across
  1. 2. Your hemisphere is tilted away from the Sun
  2. 4. The moon is big and we can see the whole thing
  3. 6. It holds galaxies and solar systems
  4. 10. The name of the inner planets
  5. 11. People from Earth can't see the whole moon
  6. 12. Oldest layers are on the bottom and youngest are on top
  7. 15. Where the Earth is in between the Sun and moon
  8. 17. This man discovered gravity
Down
  1. 1. The name of the outer planets
  2. 3. Something is moving around another object
  3. 5. Your hemisphere is tilted towards the Sun
  4. 7. An object is spinning around
  5. 8. Rocks/Fossils found in the same rock layer
  6. 9. The remains of an animal or plant
  7. 13. The moon is in between the Earth and the Sun
  8. 14. Gravity holds the planets in ____
  9. 16. Layers of the rock