Rhea (/ ˈriː.ə /) is the second-largest moon of Saturn and the ninth-largest moon in the Solar System, with a surface area that is comparable to the area of Australia. It is the smallest body in the Solar System for which precise measurements have confirmed a shape consistent with hydrostatic equilibrium.

2024年11月3日 · Rhea is the second largest moon of Saturn, but with a mean radius of 475 miles (764 kilometers) it is less than a third the radius of Saturn’s largest moon, Titan. Rhea is a small, cold, airless body that is very similar to sister moons Dione and Tethys.

Rhea, major regular moon of Saturn and the planet’s second largest, after Titan. It was discovered in 1672 by the Italian-born French astronomer Gian Domenico Cassini and named for a Titan of Greek mythology.

2024年1月22日 · Rhea is the second-largest moon of the gas giant planet Saturn. It was discovered by Italian astronomer Giovanni Cassini on Dec. 23, 1672. With a radius of 475 miles (764 kilometers), Rhea is...

Rhea is Saturn’s second largest moon and is the ninth largest moon in the solar system. Rhea was discovered in 1672 by Giovanni Domenico Cassini and was the third of Saturn’s moons to be found. In addition to a very thin atmosphere (exosphere) Rhea may also have a tenuous ring system, although this has not been confirmed.

The Rhea moon has a mean radius of 764 km (475 miles), with the dimensions 1532.4 × 1525.6 × 1524.4 km. It ranks as the ninth-largest moon in the Solar System. It is 3.4 times smaller than Titan, the biggest moon of Saturn, and 2.3 times smaller …

2016年8月1日 · Rhea (949 miles or 1,527 kilometers across) is Saturn’s second largest moon after Titan. Its ancient surface is one of the most heavily cratered of all of Saturn’s moons. Subtle albedo variations across the disk of Rhea hint at past geologic activity.

2019年7月3日 · Rhea moon is the second-largest Saturnian satellite (only Titan is larger). It's made mostly of ice, with a small amount of rocky material inside. Among all the moons of the solar system, it's the ninth-largest, and if it weren't orbiting a …

2005年12月6日 · This giant mosaic reveals Saturn's icy moon Rhea in her full, crater-scarred glory. This view consists of 21 clear-filter images and is centered at 0.4 degrees south latitude, 171 degrees west longitude.

Rhea is a small, cold, airless body that is very similar to sister moons Dione and Tethys. As with the other two moons, Rhea is tidally locked in phase with its parent — one side always faces toward Saturn — as it completes its 4.5-Earth-day orbit around the planet.