Aliens are Coming

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Across
  1. 1. My teacher calls himself
  2. 5. Planet with rings
  3. 7. This star changes Hydrogen to Helium
  4. 8. Patches that can be seen in the sky that consist of galaxies or dust
  5. 10. The distance from Earth to the sun
  6. 13. Two telescopes at opposite ends of the Earth are used to measure this, which is a stars distance
  7. 17. An area in the sky where stars appear to be near one another
  8. 18. Very cold and very far
  9. 19. The third planet closest to the sun
  10. 20. Space science
Down
  1. 2. The distance of the farthest object ever seen
  2. 3. This travels 186,000 miles a second
  3. 4. The planet that is the most similar to Earth's size but has much more atmosphere
  4. 6. The planet that has gravity three times that of Earth's
  5. 9. Nearest big galaxy to Earth
  6. 11. The star that is approximately 4 1/3 light years away from the Earth
  7. 12. Explosive creation
  8. 14. Planet so hot it could melt lead
  9. 15. The name for the rocks and dust that is between Mars and Jupiter
  10. 16. Our Galaxy