Related Clues:

• Theme of this puzzle
• Astronomer's sighting
• Hale-Bopp, e.g.
• Kitchen cleanser
• Doomsday cause, maybe
• One on the go
• Common cleanser
• Streaker in the night sky
• Celestial object
• Bill Haley bandmate
• Heavenly body with a tail
• Rival of Ajax
• Heavenly body
• One of Santa's reindeer
• One of Santa's team