Related Clues:

• Theme of this puzzle
• Astronomer's sighting
• Hale-Bopp, e.g.
• Temporary skylight?
• Shower participant?
• Falling star
• Kitchen cleanser
• Doomsday cause, maybe
• Earth threatener
• Common cleanser
• Streaker in the night sky
• Celestial object
• Old Ford
• Bill Haley bandmate
• Heavenly body with a tail