Across
- 3. Planet with fastest rotation (7)
- 8. Colour of Mar's sunset (4)
- 9. Famous astronomer (7)
- 10. Vesta is which type of celestial body (8)
- 11. Brightest planet in the night sky (5)
- 14. Name of the Sun's outermost atmosphere (6)
- 15. A highly magnetised rotating neutron star (6)
- 17. There are 181 of these in our solar system (5)
- 18. Protects Earth from radiation (10)
- 19. Smallest planet in our solar system (7)
- 20. How many stars make up the Big Dipper (5)
- 21. Only planet not named after Greek gods (5)
Down
- 1. Phenomena that keeps planets in orbit around Sun (7)
- 2. The moon Titan orbits this planet (6)
- 4. The path travelled by a celestial body in space (5)
- 5. Planet with the most moons (6)
- 6. 27 percent of the universe is composed of this (4,6)
- 7. First man to walk on moon (4,9)
- 10. Study of the stars, planets and galaxies (9)
- 12. Constellation that represents a hunter and weapons (5)
- 13. Large group of stars, dust and gas (6)
- 14. Famous asteroid (5)
- 16. Planet with supersonic winds (7)