Unit 4 Vocabulary Review

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Across
  1. 2. a person who travels and works in space
  2. 9. the path one object takes around another
  3. 10. a ball of ice and rock with a bright tail
  4. 11. the layer of gases around a planet
  5. 14. the area beyond Earth’s sky
  6. 15. information collected for study
  7. 16. to look carefully for something
  8. 17. a talk where people share different ideas
  9. 18. a trip from one place to another
Down
  1. 1. a vehicle that travels in space
  2. 3. a large body that goes around a star
  3. 4. everything that exists in space
  4. 5. a life form from another planet
  5. 6. a vehicle that moves by pushing out gas
  6. 7. to share or exchange ideas
  7. 8. a group of planets and the star they move around
  8. 12. a place where astronauts live and work in orbit
  9. 13. a huge group of stars and planets together