Related Clues:

• Martha Graham, e.g.
• Theme of this puzzle
• Astronomer's sighting
• Hale-Bopp, e.g.
• Kitchen cleanser
• Doomsday cause, maybe
• Companion of Cupid
• Number two of eight
• Common cleanser
• Jitterbug, e.g.
• See 51-Down
• Streaker in the night sky
• Celestial object
• Ballerina
• Bill Haley bandmate