The Solar System

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Across
  1. 5. Hypothetical planet once thought to exist between Mercury and the Sun
  2. 9. Largest planet in the Solar System
  3. 10. Molten rock below a planet's surface
  4. 11. Region of space dominated by the Sun's magnetic influence
  5. 13. Outer rocky shell of a planet
  6. 15. A space rock orbiting the Sun
  7. 19. Space rock hitting the ground
  8. 20. Gravitational rise and fall
  9. 21. Spherical shell of icy objects surrounding the Solar System
  10. 23. Human explorer in space
  11. 25. dwarf planet candidate named after the Norse goddess of winter
  12. 30. Temporary dark patch on the solar surface
  13. 31. Distance light travels in one year
  14. 32. Giant canyon system spanning across Mars
  15. 34. Saturn's largest moon
  16. 37. Alignment-caused light blockage
  17. 38. Spacecraft launched in 1977 that has entered interstellar space
  18. 39. Curved path of a celestial body
  19. 40. Instrument used to magnify views of distant planets and stars
  20. 42. Gaseous layer around a planet
  21. 44. Martian mountain type
  22. 45. Mission control agency in the U.S.
  23. 47. Layer between a planet's core and crust
  24. 50. Bowl-shaped impact pit left by a meteorite
  25. 51. One full orbit
  26. 52. Ice giant rotating on its side
Down
  1. 1. Light display caused by solar particles
  2. 2. The only star in the Solar System
  3. 3. The alignment of three celestial bodies in a straight line
  4. 4. Asteroid belt dwarf planet
  5. 6. The dark, shadow-like region behind a planet or moon
  6. 7. Region of space rocks located between Mars and Jupiter
  7. 8. A flash of light created when a space rock burns up in the sky
  8. 12. Volcanic moon of Jupiter
  9. 14. Time taken for one complete axial spin
  10. 16. Scientific study of celestial bodies
  11. 17. The hottest planet in the Solar System
  12. 18. Vehicle launched into space
  13. 22. Region of space around a celestial body where its gravity is the dominant force
  14. 23. Brightest moon of Uranus
  15. 24. Weighty mass metric of a celestial body
  16. 26. Planet's center
  17. 27. Space Observatory
  18. 28. Transport vehicle for space missions
  19. 29. Uncrewed space investigator
  20. 33. Earth's only natural satellite
  21. 35. Hypothetical giant planet proposed to exist in the outer reaches of our Solar System
  22. 36. Gas-dominated planet type
  23. 40. Asteroid sharing an orbit with a planet
  24. 41. Sun's outer atmosphere
  25. 43. Famous comet that returns near Earth every 75-76 years
  26. 46. The glowing ring-shaped light visible during a total solar eclipse
  27. 48. Measure of cosmic body brightness
  28. 49. Sudden burst of solar radiation