Stars Review

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Across
  1. 3. our sun is 4.5 --- years old
  2. 5. the end of a giant star
  3. 7. the process by which stars make their energy
  4. 9. the fuel for a star
  5. 11. the end of our sun in 5 billion years
  6. 12. the star always seen in the north
  7. 13. colour of the coolest stars
Down
  1. 1. a giant star lives only to be about 1 --- years old
  2. 2. the cloud of gas and dust in which stars are born
  3. 4. the end of a large star
  4. 6. the outward explosion of a large or giant star
  5. 8. colour of the hottest stars
  6. 10. the colour of our sun
  7. 11. Sirius is this colour