space

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Across
  1. 3. 8 of them in space
  2. 5. the biggest star in the solar system, and it is really hot
  3. 6. fist living thing in space
  4. 7. a dwarf planet
Down
  1. 1. orbits the Earth, reflects light from the sun
  2. 2. big balls of gas
  3. 4. people that go into space