SPACE&ALIENS

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Across
  1. 2. Bright ball of fire
  2. 3. A huge group of stars and dust
  3. 5. Path around the sun
  4. 10. Rock that burns in the sky
  5. 12. Force that keeps us on the ground
  6. 13. Tool to see things far away
  7. 15. Person who travels in space
Down
  1. 1. A large round object around a star
  2. 4. Creature from another world
  3. 6. Vehicle used to fly into space
  4. 7. Ball of ice with a tail
  5. 8. Hole on a moon or planet
  6. 9. Gas needed to breathe
  7. 11. Planet famous for its rings
  8. 14. The center of our system