Related Clues:
- Science series
- Reindeer name
- Halley's __ (celestial visitor)
- Orbiter with a tail
- Bygone Chevy compact
- PBS staple since 1974
- ____ Scotia
- Astronomical wonder
- Result of runaway fusion
- Astronomical discovery
- Milky Way phenomenon believed to occur almost weekly
- Halley's, for example
- Everything bagel topper
- PBS series since 1974
- Star that brightens suddenly