Rhea (/ ˈ r iː. 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 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.

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...

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 …

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 …

Find out information about the moon Rhea, the second largest moon of the planet Saturn. Learn about its history, its physical structure, its surface and geological characteristics, its atmosphere. Know more about its ring system and its exploration.

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.

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.

Discovered in 1672 by Giovanni Cassini, Rhea is the ninth-largest moon in the solar system, and the second-largest of Saturn (behind Titan). Rhea is one of the smallest objects to be in hydrostatic equilibrium on account of its 75% water-ice composition and is very similar to its neighbouring moons Dione and Tethys who also orbit close to Saturn .

Rhea is the 2nd largest moon of planet Saturn. It is composed of 75% water ice and 25% rocky material, and has a thin oxygen atmosphere. It's surface has ice cliffs and dark areas made of complex organic compounds. For a listing of all moons, see Moons of the Planets.