Rhea is a moon of Saturn and is the second largest moon in the Saturnian system, after Titan. It was discovered in 1672 by the Italian astronomer Giovanni Domenico Cassini. Rhea has a diameter of about 1,528 kilometers and orbits Saturn at a distance of about 527,000 kilometers. Its surface is heavily cratered, with some areas covered in bright, icy material and other areas marked by long, linear features called "lineae". Rhea is composed mainly of water ice, with small amounts of rock and other materials. It has a relatively low density, suggesting that it may have a partially liquid interior, with an ocean of liquid water sandwiched between layers of ice. One of the most interesting features of Rhea is a huge impact crater called Tirawa, which is about 400 kilometers wide and has a central peak that rises about 10 kilometers above the crater floor. Rhea also has a system of fractures called "wispy terrain" that extend across its surface and are thought to be related to tectonic activity. Rhea has been visited by several spacecraft, including the Voyager 1 and 2 spacecraft and the Cassini spacecraft, which made numerous flybys of the moon during its mission. These missions have provided valuable insights into the geology and composition of Rhea and have helped to deepen our understanding of the Saturnian system.
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