The ring’s origin was originally connected to the lacking moon Dia, but Dia’s Restoration in 2010 disproved this link. Rhea is the 2nd largest moon of Saturn. Rhea has a thin atmosphere―termed an exosphere―and is also the primary area a spacecraft foundtraces of oxygen in an ambiance outside of Earth. https://moons38260.targetblogs.com/35175068/the-2-minute-rule-for-best-moons