Space

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Across
  1. 2. iron
  2. 5. our universe
  3. 8. universe expanding and cooling
  4. 9. center of star
  5. 10. beginning of the universe
Down
  1. 1. planet
  2. 3. sun and family of planets
  3. 4. make up galaxies
  4. 6. center of sun
  5. 7. U,Hg,Au