Astronomy crossword two-speed

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Across
  1. 2. The blue planet (7) / Poseidon? No, not quite (7)
  2. 5. Pointer of the Southern Cross (8) / One horse-man and we’re in the Southern Cross (8)
  3. 6. Big, big space rock (9) / “EMOTE? Re: It” crack code for a space rock (9)
  4. 9. Arrangement of stars (13) / Titan colonels change arrangement of stars (13)
  5. 11. Going around in ellipses (5) / Hiding Mark’s orb? It’s going around the sun! (5)
  6. 13. The ringed planet (6) / Beyonce must have really liked this planet (6)
  7. 15. Famous red star (10) / Gee, use belt in parts and you’ll get a big, red star! (10)
  8. 17. Earth’s floating friend (4) / Cow’s moo not hidden - you can see it! (4)
  9. 18. Summer, Autumn, Winter, Spring (7) / Ocean’s boys for the year’s divisions (7)
  10. 19. Moon First phase (3, 4) / What we see before waxing? (3, 4)
Down
  1. 1. Our biggest gas giant (7) / Israeli’s bread sounds like a planet (7)
  2. 3. This planet (5) / Each animal roams this habitat starting on this planet (5)
  3. 4. One complete orbit (10) / Che Guevara? Vladimir Lenin? Got this in common (10)
  4. 7. Loop motion (10) / Seen retro? Grade this crossword in a backwards loop! (10)
  5. 8. Halley’s ____ (5) / Company? I saw them with Halley (5)
  6. 10. The effect of space on the world (9) / Rocket-boy? Starting now on Mercury? Why? Space effects the world (9)
  7. 12. The effect of the stars on you (9) / Nicole Kidman is autographing! What’s yours? They make up these ideas (9)
  8. 14. The red planet (4) / Chocolate bar or god of war? (4)
  9. 16. Lunar or solar? (7) / Brisbane clips Emerald some light obscured (7)