rhea
n. countablen. a large, cold moon that orbits the planet Saturn. It is covered in ice and has many craters on its surface.
n. the second-largest moon of Saturn, composed primarily of water ice with a rocky core. It is a geologically inactive body characterized by a heavily cratered surface and a thin atmosphere of oxygen and carbon dioxide.
Rhea is one of the many moons orbiting Saturn.
Images from the Cassini spacecraft revealed that Rhea has a very thin atmosphere, which was a surprising discovery for a moon of its size.
As the second-largest satellite of Saturn, Rhea maintains a synchronous rotation, meaning the same face is always directed toward the gas giant as it completes its orbital path.
From Ancient Greek Ῥέα (Rhéa).
Variant of Rea.
When referring to the specific moon of Saturn, it is treated as a proper noun and capitalized.