The Universe and everything in it!

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Across
  1. 1. A group of millions of stars
  2. 3. A dwarf planet
  3. 5. A galaxy
  4. 8. A shooting star
  5. 10. No moons
  6. 13. Planet with life
  7. 14. A day longer than a year
  8. 15. Huge heat source
Down
  1. 2. A lump of rock or metal that moves around the sun
  2. 4. The flattest planet
  3. 6. A huge ball of gas, the sun is one
  4. 7. We have eight of them
  5. 8. Tallest mountain on a planet
  6. 9. A very stormy/cold planet
  7. 11. When the moon and sun a line
  8. 12. A ball of ice and dust