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Across
  1. 4. The galaxy that contains our solar system
  2. 7. An imaginary line an object spins around
  3. 8. A scientist who studies space
  4. 11. A group of stars forming a pattern
  5. 13. A large cloud of gas and dust in space
  6. 14. An object that orbits a planet
  7. 16. The force that pulls objects toward each other
  8. 18. A small planet that orbits the sun
  9. 19. The layer of gases around a planet
Down
  1. 1. A space rock that burns in Earth’s atmosphere
  2. 2. A rocky object that orbits the sun
  3. 3. The amount of matter in an object
  4. 4. A meteor that reaches Earth’s surface
  5. 5. The act of traveling to learn about space
  6. 6. All of space and everything in it
  7. 9. A vehicle designed to travel in space
  8. 10. A measure of how hot or cold something is
  9. 12. The movement of one object around another
  10. 15. The spinning of an object on its axis
  11. 17. A huge system of stars, gas, and dust