Regular moon
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In astronomy, a regular moon or a regular satellite is a natural satellite following a relatively close, stable, and circular orbit which is generally aligned to its primary's equator. They form withi
Active plumes on the south pole of Saturn's moon Enceladus, fed by a global subsurface ocean of liquid water
Jupiter family
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Satellite system (astronomy)
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A satellite system is a set of gravitationally bound objects in orbit around a planetary mass object or minor planet, or its barycenter. Generally speaking, it is a set of natural satellites, although
Saturn, its rings and major icy moons—from Mimas to Rhea.
Formation of Pluto's moons. 1: a Kuiper belt object nears Pluto; 2: the KBO impacts Pluto; 3: a dust ring forms around Pluto; 4: the debris aggregates to form Charon; 5: Pluto and Charon relax into spherical bodies.
Model for formation of Jupiter's rings
Gas toruses in the Jovian system generated by Io (green) and Europa (blue)