A ring-crossing is where Saturn’s rings seem ... around a planet at the same time as the planet itself forms. Irregular moons are thought to be small planets (planetesimals) that are captured ...

A ring-crossing is where Saturn’s rings seem ... around a planet at the same time as the planet itself forms. Irregular moons are thought to be small planets (planetesimals) that are captured ...

For example, ring particles — the tiny fragments of ... circular orbits close to the equator of their host planet; and irregular moons, which can be much smaller and have larger, more elliptical ...

The moons that orbit Uranus are already known to have unusual characteristics: some are heavily cratered, others have ...

Most of the rings have a prograde orbit, in the same direction as Saturn, but the outermost (the Phoebe ring) is thought to originate from Phoebe, the largest of Saturn's irregular moons—and ...

A ring-crossing is where Saturn’s rings seem to disappear ... Regular moons are formed around a planet at the same time as the planet itself forms. Irregular moons are thought to be small planets ...