Across
- 2. hottest part of the Sun
- 6. smallest planet
- 8. like a gas but composed of ions
- 10. spring ___ marks the end of winter
- 14. "backward" motion of planets as seen from Earth
- 16. hottest planet
- 18. the longest or shortest day of the year
- 19. "fourth rock from the Sun"
- 23. best known dwarf planet
- 25. having the Sun at the centre
- 26. force that holds the Sun together
- 27. largest planet
- 28. the North Star
- 30. element discovered on the Sun
Down
- 1. type of telescope used to see a black hole
- 3. planet with the largest orbit
- 4. an event where the Sun, Earth and Moon line up
- 5. huge ball of hot plasma
- 6. "shooting stars"
- 7. the Earth ___ around the Sun
- 9. rotates on its axis every 27 days
- 11. having the earth at the centre
- 12. farthest planet visible with the naked eye
- 13. the Sun is mostly made of ___
- 15. shape of planetary orbits
- 17. astronomical ___ is the Earth-Sun distance
- 20. the Earth ___ on its axis
- 21. nuclear ___ powers the Sun
- 22. our star
- 24. path the Sun traces out through the stars
- 29. the phase of the moon during a solar eclipse