Related Clues:

• Astronomer's sightings
• Ganymede and Lysithea, to Jupiter
• Saturn has many
• Phoebe and Rhea, to Saturn
• Time periods lasting about 29 1/2 days
• Shows a seat?
• Mercury's lack
• Jupiter has 63
• Hindsights?
• Mars pair
• Io and Ganymede, e.g
• Crescent and half
• Saturn's 18
• Phobos and Deimos, to Mars
• Jupiter has many