Moons

A subsatellite, also known as a submoon, or moonmoon, or a schmoon, is a "moon of a moon" or a hypothetical natural satellite that orbits the moon of a planet.It is inferred from the empirical study of natural satellites in the Solar System that subsatellites may be rare, albeit possible, elements of planetary systems.

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Galilean Suite: Listen To The Major New Classical Work Dedicated To Jupiter’s Moons

Icy Oceans Exist on Far-Off Moons. Why Aren’t They Frozen Solid? The moons orbiting Jupiter and Saturn appear to have subsurface oceans — tantalizing targets in the search for life beyond Earth. But it’s not clear why these seas exist at all.

Saturn’s Rings May Have Formed Following Massive Collision between Two Moons, Scientists Say

In 1914 astronomers at the Royal Observatory made a careful study of the transit of Mercury in order to determine whether Mercury had any moons and essentially proved that the planet has no moon through direct observation

Video: How Saturn’s Moons Formed in a Massive Moon Collision

Whether Saturn's Rings are Young or Old, its Moons are as Ancient as the Planet Itself

Webb Images Saturn, Its Moons and Ring System

First off-earth phosphates detected in the oceans of one of Saturn's moons

Buoyant Rover for Under-Ice Exploration. It uses buoyancy force to enable roving along the underside of the ice. The robotic submersible could one day explore ice-covered oceans on moons like Europa and Enceladus. Photos from NASA/Jet Propulsion Laboratory