Interstellar Crossword

123456789101112131415
Across
  1. 2. Small pieces that broke off of a comet
  2. 4. A large body orbiting a star
  3. 6. Scientists who study stars, planets and space
  4. 8. an oval
  5. 9. A building with special tools to look at space
  6. 12. One half of a round object, especially a planet
  7. 14. The amount of mass packet closely together
  8. 15. An imaginary line that an object spins around
Down
  1. 1. The orbiting of one spacial body around another
  2. 3. Any large self-lighting body in space
  3. 5. Made mostly of rock and metal
  4. 7. The layer of gases that surrounds a planet
  5. 10. Small, rocky objects that travel around the sun
  6. 11. To go around an object or a planet
  7. 13. A planetary satellite