Isaac's Space and Science

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Across
  1. 2. Moon that is larger than Mercury, and Titan
  2. 5. The study of chemicals in space
  3. 7. A group of stars
  4. 8. Heated electromagnetic gas
  5. 12. The star with 7 Earth sized planets
  6. 13. Relating to the sun
  7. 16. Going to collide with the Milky Way
  8. 17. The study of life
  9. 19. Latin for gold
  10. 20. The form of static electricity in clouds
Down
  1. 1. Includes Lutetium
  2. 3. Argentum
  3. 4. Seventh planet
  4. 5. Third Noble gas
  5. 6. Reddest object in the solar system
  6. 9. NASA sent these missions to the moon
  7. 10. The study of weather
  8. 11. A star; biggest in the Orion
  9. 14. Includes chlorine and and iodine
  10. 15. Aurorae at poles, not Jupiter or Earth
  11. 18. Radioactive noble gas