13s

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Across
  1. 4. "Spacecraft propulsion" Six
  2. 5. "Earth's sister planet" Five
  3. 7. "A cloud of gas and dust in space" Six
  4. 8. "A system of millions or billions of stars" Six
  5. 10. "Path of a celestial body" Five
  6. 11. "A celestial hunter" Five
  7. 13. "Relating to the sun" Five
  8. 14. "Saturn's largest moon" Five
Down
  1. 1. "Icy celestial traveler" Five
  2. 2. "The red planet" Four
  3. 3. "A streak of light in the sky" Six
  4. 6. "Dwarf planet" Five
  5. 9. "Relating to the moon" Five
  6. 12. "Our home planet" Five
  7. 13. "Celestial bodies emitting light" Five