Space

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Across
  1. 4. point of highest ascent
  2. 5. relating to the moon
  3. 9. star-related prefix
  4. 10. sky glow from charged particles
  5. 11. streak of light from falling debris
  6. 13. robot exploring alien terrain
  7. 14. orderly whole of the universe
  8. 17. path a body follows around a star
Down
  1. 1. long constellation winding across the sky
  2. 2. cloud of gas lit from within
  3. 3. impact hollow on a moon or planet
  4. 6. spot directly overhead
  5. 7. vast and universal
  6. 8. immense stellar island
  7. 10. name tied to early moon flights
  8. 12. hunter’s pattern in the night
  9. 14. icy traveller with a glowing tail
  10. 15. powered by the sun
  11. 16. darkest part of a shadow