Related Clues:
- Sort of star
- Pop star?
- Creation alternative
- Astronomer's sighting, sometimes
- Certain variable star
- It's super when exploding
- Temporary superstar?
- Explosion that started it all?
- Show in outer space?
- Universal theory
- PBS science program
- Star with potential
- PBS staple
- Theory of the universe, or a hint to the starts of 17-Across and 7-, 10-, 35- and 40-Down
- Cataclysmic explosion