Stars

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Across
  1. 3. oval or spherical shaped with little dust and gas
  2. 6. bright, hot gas that undergoes nuclear fusion
  3. 7. how bright a star really is
  4. 9. large cloud of gas and dust in interstellar space
  5. 11. lacks a defined, regular shape
  6. 12. proved that the universe is expanding
  7. 13. releases massive amounts of energy
  8. 14. is a spiral universe that is home to trillions of stars and the dwarf planet Pluto
Down
  1. 1. temperature increases as you move from right to left
  2. 2. matter and space contained in
  3. 4. how bright a star appears to be
  4. 5. Baby Star
  5. 8. Diaganol line, sun located in this stage
  6. 10. measures the total amount of light emitted by a celestial object