Saturn and Jupiter, the two gas giants, have long vied for the title of “moon king.” Over the years, astronomers have been slowly discovering tiny moons orbiting both. These discoveries sometimes changed the ranking,

The sheer number of objects suggests scientists will soon have to grapple with what counts as a moon versus what’s just a large rock

The discovery points to what astronomers have thought for decades, that Saturn's rings were caused by a massive collision about 100 million years ago.