Related Clues:

• It has solar heating
• Mercury or Saturn
• Heavenly body
• Krypton, for one
• Mercury, for one
• Probe's target
• Venus or Mars
• Space occupier
• Opal or onyx
• Revolutionary figure?
• Venus, e.g.
• Mars, for one
• Starship stop
• Celestial body
• Ruby, e.g.