Amazingly, Janus and Epimetheus are on almost – but not quite – the same orbit around Saturn! Currently, Janus is a bit closer to Saturn than Epimetheus. I say “currently”, because every ...

You might think this is crazy, but our Solar System has an example where this happens: two of Saturn's Moons, Epimetheus and Janus. Every four years, whichever moon is interior (closer to Saturn ...

Saturn’s moons Janus and Epimetheus run on orbits that differ in size by only 30 miles (50 km). This similarity results in a surprising interaction: The two moons swap orbits every 4 years.

It has been hypothesized that Janus and Epimetheus were once one larger moon, one that broke apart in some long-ago collision. You may use this page to discuss moons or other astronomical bodies ...