space

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Across
  1. 4. __ Galilei, an astronomer
  2. 7. a person aboard a spacecraft
  3. 8. the planet closest to the Sun
Down
  1. 1. the planet with the most number of rings
  2. 2. a galaxy that includes our Solar System
  3. 3. to describe something measured from the centre of the earth
  4. 5. a dwarf planet
  5. 6. a group of stars that appears to form a pattern or picture
  6. 9. similar to 'spaceship'