Life in space vocabulary

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Across
  1. 2. space and everything that exists
  2. 4. huge number of stars and their solar system
  3. 7. scientist who studies stars,planets & space
  4. 8. people trained to travel and work in space
Down
  1. 1. force that pulls objects together
  2. 3. cluster of stars that make a picture
  3. 5. used force to start something moving
  4. 6. movement of one object around another