Related Clues:
- Pluto, until recently
- Lonely ___
- World
- Source of energy, in astrology
- Pluto, once
- Krypton or Vulcan
- One of these can be found reading counterclockwise somewhere in each concentric ring
- Earth is one
- Mars or Jupiter
- Mercury, e.g.
- Mercury or Mars
- Kent's paper
- Rock around a star
- Krypton or Ork
- Krypton, in science fiction