Explorers on the moon

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Across
  1. 3. A famous Belgian boy reporter.
  2. 6. The family name of the brilliant but absent-minded professor.
  3. 8. The opposite of wide.
  4. 11. British term for a wrench.
  5. 13. The family name of the twin detectives.
  6. 15. The first name of the professor.
  7. 16. Emptiness or bleakness.
  8. 21. The Belgian reporter's loyal white terrier.
  9. 22. A natural underground chamber.
  10. 23. A bed, often stacked in twos.
  11. 24. Worn to protect clothes when cooking or working.
  12. 26. The name of the shuttle used to travel to the moon and back.
  13. 31. A space rock that lands on Earth.
  14. 33. Shockingly bad or unpleasant.
  15. 34. A breed of sheep known for its fine wool.
  16. 35. Absolutely necessary or urgent.
  17. 38. The study of stars, planets and space.
  18. 40. To leave someone stranded, especially on an island or in space.
  19. 41. A deep crack in a glacier or ice field.
  20. 42. Related to atomic energy or weapons.
  21. 43. A herbal plant used in calming tea.
  22. 44. A radioactive element used in nuclear energy.
  23. 45. The family name of the astronaut assistant on the moon mission.
  24. 46. A system or building with many parts or functions.
  25. 47. A sea captain with a fiery temper who likes drinking whisky.
  26. 49. A sea creature with a gelatinous body and stinging tentacles.
Down
  1. 1. Someone who has committed a crime or done something wrong.
  2. 2. What are spiky formations rising from the cave floors.
  3. 4. A small tower on a building or vehicle.
  4. 5. Resistance caused when two surfaces rub.
  5. 7. How do you call a scientist who studies space.
  6. 9. The layer of gases surrounding a planet.
  7. 10. A magical story for children.
  8. 12. A silly or foolish person.
  9. 14. To argue over something that is not important
  10. 15. A bowl-shaped hole caused by the impact of a meteorite.
  11. 17. A suite worn by astronauts to survive in space.
  12. 18. A person or thing hard to get rid of.
  13. 19. A device that maintains orientation using rotation.
  14. 20. The name of the villainous stowaway aboard the moon rocket.
  15. 25. What are pointy structures hanging from the cave ceilings.
  16. 27. A violent tropical storm.
  17. 28. Speed in a given direction.
  18. 29. Based on trial and testing.
  19. 30. The path of a satellite around a planet.
  20. 32. Impossible to endure.
  21. 36. Related to the Earth.
  22. 37. How do you call the study of caves.
  23. 38. Something man-made, not natural.
  24. 39. Little by little, over time.
  25. 48. Essential gas we breathe.