Travel into space

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Across
  1. 2. symbol H, an element, the lightest gas
  2. 4. a spacecraft that is driven by a rocket
  3. 9. a system of millions or billions of stars
  4. 10. the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun
  5. 11. a person trained to travel in a spacecraft
  6. 14. a suit so astronauts can survive in space
  7. 15. a person who designs, builds, or maintains engines, machines, or structures
Down
  1. 1. Objects made of frozen gases, rock and dust that orbit the Sun
  2. 3. Small particles of matter in space
  3. 5. the collection of eight planets and their moons in orbit round the sun
  4. 6. branch of science which deals with space
  5. 7. the planet on which we live
  6. 8. national aeronautics and space administration
  7. 11. a small rocky body orbiting the sun
  8. 12. a celestial body moving in an elliptical orbit round a star
  9. 13. when one celestial body blocks light from reaching another by moving between it and its light source
  10. 16. the force that pulls objects towards each other