Coalface - Space

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