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