Across
- 3. how stars and planets were formed
- 5. the explosion of a star
- 6. occurred 15 billion years ago
- 7. the sun
- 8. clumping smaller particles into larger masses forming planets
- 11. giant the su will turn into this eventually
- 12. the release of volatile substances and water vapor
- 13. shrinks under its own weak gravity
- 14. of rainfall
- 15. every chemical element that made the planets star oceans and organisms
Down
- 1. spinning skater
- 2. suggests that energy from thermal vents in the sea
- 4. iron sunk to the middle of the planet
- 9. building blocks of proteins
- 10. stars twinkle because of elements being converted over to other elements which gives off