Jupiter

Jupiter is the biggest planet in the solar system and has an estimated 79 moons in total, one of them being Io where part of the fight between Saitama and Monster Garou took place.

Trivia

 * Psykos compared God's appearance to the surface of Jupiter.
 * Chapter 143 is titled "Jupiter, the Bringer of Jollity", in reference to the song of the same name.