Across
- 7. the git, dense core remains
- 8. biggest explosion in universe, forming heavy elements like gold and uranium
- 9. fusion forms elements up to iron and the star’s outer layers expand
- 10. nebula the outer layers escape the core’s gravity and drift out into space
- 11. more than 8 times the mass of the sun, only last about a million years
Down
- 1. a megastar collapses into a single point, with enough gravity to trap light
- 2. hydrogen gas is pulled into a dense ball by gravity
- 3. hot, superdense care made up of neutrons
- 4. predicted to form when a white dwarf cools
- 5. the sun and other small stars remain stable for billions of years
- 6. helium starts to fuse and the star’s outer layers expand