Part of Scales of the Universe.

Janus_HERO AMNH/D. Finnin

If the Hayden Sphere is the size of Earth, then this model is the relative size of Saturn’s moon Janus.

Janus orbits just outside the main rings of Saturn and is a small moon. The two largest moons in the solar system are bigger than the planet Mercury. The tiniest moons are no bigger than the island of Manhattan.