Puzzle #19

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Across
  1. 2. The hottest planet in the Solar System. (5)
  2. 6. Roughly 93 million miles. (12, 4)
  3. 8. The first shuttle to reach space. (8)
  4. 9. The craft that orbited a comet. (7)
  5. 10. First artificial Earth satellite. (7)
  6. 13. Cosmic body with extremely intense gravity. (5, 4)
  7. 15. First animal to be launched into space. (5)
  8. 17. The largest known volcano in the solar system. (7, 4)
  9. 18. First man in space. (4, 8)
  10. 20. A failed star, perhaps? (7)
  11. 22. Plto's largest moon. (6)
  12. 23. It orbited Ceres. (4)
  13. 24. Our closest star. (3, 3)
Down
  1. 1. Planet with the most number of moons. (6)
  2. 3. The last evolutionary stage of a massive star. (9)
  3. 4. This spacecraft landed on a comet. (6)
  4. 5. Largest moon in our solar system. (8)
  5. 7. Originally called “Le Verrier’s planet”. (7)
  6. 11. First man on the moon. (4, 10)
  7. 12. This spacecraft orbited Jupiter. (7)
  8. 14. Coldest known object in the solar system. (6)
  9. 16. The closest major galaxy. (9)
  10. 19. A "star sailor". (9)
  11. 21. Originally called “George’s Star”. (6)