Across
- 4. A supernova with no hydrogen.
- 5. Nuclear explosions at high temperatures.
- 7. A temporary brightening of a star that does not result in its death.
- 9. The remnant of a low- or medium-mass star.
Down
- 1. A star that has expanded into a larger red star.
- 2. A powerful explosion of a star.
- 3. A supernova type that has hydrogen.
- 6. The _____ limit is approximately 1.44 solar masses.
- 8. A cloud of dust and gas left over from a supernova explosion.