Stars and Galaxies

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Across
  1. 6. a force that pulls planets and other celestial bodies towards their centre
  2. 7. If they are not Jovian planets they are ... planets
  3. 9. Nasa landed this on Mars this February
  4. 12. collection of millions or billions of stars
  5. 13. When stars explode during dying, creating a dazzling display of light
  6. 15. A star that has run out of hydrogen in its core
  7. 16. The earths star
Down
  1. 1. Our galaxy
  2. 2. Conversion of hydrogen to helium in a star
  3. 3. Closest planet to the sun
  4. 4. Type of planet that is made up of gas
  5. 5. Furthest planet from the sun.
  6. 8. First stage in the lifecycle of a star
  7. 10. How many planets in our solar system
  8. 11. An object made up of gas
  9. 14. Our galaxies only planetoid