Across
- 2. / Second closest star.
- 6. / Discovered Jupiter’s moons.
- 8. / Space equilibrium points.
- 9. / Proposed heliocentric theory.
- 13. / Largest constellation.
- 14. / Planet with rings and 146 moons.
- 16. / Earth’s radiation belts.
- 19. / Polar lights.
- 21. / Morning Star; hottest planet.
- 22. / Belt beyond Neptune.
- 23. / Farthest and windiest planet.
- 24. / Another name for universe.
- 25. / Neptune’s largest moon.
Down
- 1. / Universe origin theory.
- 3. / The Hunter constellation.
- 4. / Longest or shortest day.
- 5. / Biggest planet.
- 7. / Dwarf planet with moon Charon.
- 10. / Outer gas layer of Moon.
- 11. / Cross-shaped constellation.
- 12. / Nearest galaxy to Milky Way.
- 15. / Largest moon of Saturn.
- 17. / Equal day and night.
- 18. / Icy body with a tail.
- 20. / Belt between Mars and Jupiter.