Across
- 3. What shape is the Milky Way (6)
- 9. In 1781, Uranus was discovered using this device (9)
- 10. The name of the NASA rover launched to Mars in 2011 (9)
- 14. The hottest planet in our solar system (5)
- 15. The first human to travel in space (4,7)
- 16. A theoretical passage through space-time (8)
- 17. What is a meteor called when it reaches Earth's surface (9)
- 18. Which planet is furthest from the sun (7)
- 20. The brightest comet in the solar system (7,5)
- 21. What force bends light rays travelling through the universe (8)
Down
- 1. In what month is the Earth closest to the sun (7)
- 2. What you hear in space (7)
- 4. What unit of length that is approximately 3.26 light years (6)
- 5. What was Sputnik (9)
- 6. Which planet does Titan orbit (6)
- 7. Who was the first man to walk on the moon (4,9)
- 8. A place with a gravitational field that not even light can escape (5,4)
- 11. The largest moon in the solar system (8)
- 12. The moon Callisto orbits this planet (7)
- 13. Closest galaxy to the Milky Way (9)
- 19. How many people have walked on the moon (6)