Isaac's Space and Science

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