Unit 2: Out of this world

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Across
  1. 4. a giant rock made of minerals
  2. 6. there are found in the centre of galaxies
  3. 8. an astronomical object made of hydrogen
  4. 10. a person who goes on space missions
  5. 11. an astronomical object made of ice that leaves a tail
  6. 14. a really energetic phenomena that expulses gamma beam
  7. 16. the part of the spacecraft that has the crew
  8. 17. a titanic group of stars, planets and gas
Down
  1. 1. the distance that light travels in one year
  2. 2. a man-made object design to go to space
  3. 3. the natural satellite of the Earth
  4. 5. the planet where we live
  5. 7. a group of astronauts that go in a spacecraft
  6. 8. a large structure used to make experiments
  7. 9. a person that studies space
  8. 12. an astronomical object that orbits a star
  9. 13. the force that attracts objects
  10. 15. the explosion of a massive stars, really energetic phenomena