1s

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Across
  1. 4. - A dwarf planet, five letters
  2. 5. - The final frontier, five letters
  3. 6. - The Red Planet, four letters
  4. 8. - Related to the moon, five letters
  5. 10. - A space object with a tail, five letters
  6. 11. - A streak of light in the sky, six letters
  7. 14. - Saturn's largest moon, five letters
  8. 15. - Path of a celestial object, five letters
Down
  1. 1. - A celestial object with a tail, five letters
  2. 2. - Our home planet, five letters
  3. 3. - Earth's sister planet, five letters
  4. 7. - Pertaining to the sun, five letters
  5. 9. - Extraterrestrial being, five letters
  6. 12. - A constellation named after a hunter, five letters
  7. 13. - Celestial bodies that twinkle, five letters