This false-color composite was created with images taken during the Cassini spacecraft’s closest flyby of Titan on April 16, 2005.
Dione & Rhea – Enceladus & Tethys
Image Credit: NASA/JPL-Caltech/Space Science Institute, Processed by Kevin M. Gill
Mimas – January 30 2017
Image credit: NASA/JPL/Kevin M. Gill
Saturn, rings and moons seen by the Cassini spacecraft wow!
Image credit: NASA/JPL (original video)
Umbriel moon of Uranus and Triton moon of Neptune. Umbriel was discovered on October 24, 1851 by William Lassell. Triton was discovered on October 10, 1846 by the English astronomer William Lassell.
Saturn, rings and moons
NASA/JPL-Caltech/SSI/Kevin M. Gill
The Galilean moons are the four largest moons of Jupiter — Io, Europa, Ganymede, and Callisto. They were first seen by Galileo Galilei in January 1610, and recognized by him as satellites of Jupiter in March 1610. They are the first objects found to orbit another planet. Their names derive from the lovers of Zeus.
They are the first objects found to orbit another planet. Their names derive from the lovers of Zeus. They are among the largest objects in the Solar System with the exception of the Sun and the eight planets, with a radius larger than any of the dwarf planets.
With over 400 active volcanos, Io is the most geologically active object in the Solar System. Its surface is dotted with more than 100 mountains, some of which are taller than Earth’s Mount Everest. Unlike most satellites in the outer Solar System (which have a thick coating of ice), Io is primarily composed of silicate rock surrounding a molten iron or iron sulfide core. Although not proven, recent data from the Galileo orbiter indicate that Io might have its own magnetic field.
Europa the second of the four Galilean moons, is the second closest to Jupiter and the smallest at 3121.6 kilometers in diameter, which is slightly smaller than the Moon. The name comes from a mythical Phoenician noblewoman, Europa, who was courted by Zeus and became the queen of Crete, though the name did not become widely used until the mid-20th century.
It has a smooth and bright surface, with a layer of water surrounding the mantle of the planet, thought to be 100 kilometers thick. The smooth surface includes a layer of ice, while the bottom of the ice is theorized to be liquid water. The apparent youth and smoothness of the surface have led to the hypothesis that a water ocean exists beneath it, which could conceivably serve as an abode for extraterrestrial life.
Callisto is the fourth and last Galilean moon, and is the second largest of the four, and at 4820.6 kilometers in diameter, it is the third largest moon in the Solar System, and barely smaller than Mercury, though only a third of the latter’s mass. It is named after the Greek mythological nymph Callisto, a lover of Zeus who was a daughter of the Arkadian King Lykaon and a hunting companion of the goddess Artemis. It is one of the most heavily cratered satellites in the Solar System, and one major feature is a basin around 3000 km wide called Valhalla.
Saturn, rings and moons (Tethys, Enceladus, Titan and Janus, Prometheus, Atlas, Iapetus, Atlas, Methone and Titan).
image credit: NASA/JPL (processed by Elisabetta Bonora & Marco Faccin,