Across
- 6. A vast, spherical shell of icy objects that marks the outermost edge of the solar system.
- 8. Ice giant that rotates on its side, with faint rings and 27 discovered moons.
- 10. A Mars-sized planet that collided with early Earth, creating the Moon and giving Earth its axial tilt.
- 16. A hypothetical distant planet beyond Neptune with an extremely wide orbit, possibly 600 AU or more from the Sun.
- 17. A distant zone beyond Neptune containing icy bodies, dwarf planets like Pluto, and comets.
- 21. One of the largest asteroids in the asteroid belt, nearly a dwarf planet.
- 22. An icy moon of Jupiter that may have a subsurface ocean.
- 23. The largest object in the asteroid belt, classified as a dwarf planet.
- 24. Hottest planet with a thick, toxic atmosphere and runaway greenhouse effect.
- 26. A protoplanet that collided with Uranus, causing its extreme 98-degree axial tilt.
- 27. A theorized former planet between Mars and Jupiter whose destruction may have formed the asteroid belt.
- 29. Gas giant known for its spectacular ring system featuring rings A, B, C, D, E, F, and G.
- 30. A tiny moon with two distinct lobes, resembling a peanut. Also likely to be a contact binary and is one of Pluto's five moons.
- 34. Largest moon of Uranus, icy and heavily cratered.
- 35. A hypothetical giant planet thought to reside in the distant Oort Cloud, possibly a cold gas giant.
- 36. The outer boundary of the heliosphere where the solar wind meets interstellar space.
- 37. Earth's only natural satellite, also called the Moon.
- 39. Icy moon of Saturn with water geysers and possible subsurface ocean.
Down
- 1. A heavily cratered moon of Jupiter, ancient and geologically inactive.
- 2. Dwarf planet with icy plains and a heart-shaped region. Also has five moons.
- 3. The star at the center of our solar system, source of light and heat. Normally called the Sun
- 4. Pluto’s largest moon, nearly half its size, forming a double system.
- 5. Jupiter’s largest moon and the biggest moon in the solar system. Also bigger than Mercury.
- 7. Neptune’s largest moon, with geysers and a retrograde orbit.
- 9. The smallest planet and closest to Helios.
- 11. A dark, icy moon of Uranus, covered in craters and mysterious bright ring-shaped features.
- 12. A newly hypothesized dwarf planet that is another suspect of asteroid belt formation.
- 13. The farthest major planet, deep blue and very windy.
- 14. The outermost and largest of Pluto’s small moons, oddly shaped.
- 15. Small moon of Saturn with a huge crater resembling the Death Star. Also smallest spherical object in the solar system.
- 18. A region between Mars and Jupiter filled with rocky bodies, including Ceres, Vesta, and many smaller asteroids.
- 19. A small asteroid with a bright surface and a big impact crater (at least when compared to the asteroid's size).
- 20. Jupiter’s volcanic moon, the most geologically active body in the solar system.
- 21. The bubble-like region of space shaped by the solar wind, enclosing the entire solar system.
- 25. Another name for Earth, the only known planet with life.
- 28. Neptune’s second-largest moon, irregularly shaped and dark.
- 31. The smallest and innermost of Pluto’s moons, with a chaotic rotation.
- 32. Saturn’s largest moon, with thick atmosphere and liquid methane lakes. Also bigger than Mercury.
- 33. The Orange Planet, known for its dusty surface and potential past water.
- 38. A small, irregular moon with a bright, reflective surface. One of Pluto's five moons.