On 13 Marsh, 2006, NASA’s Cassini spacecraft took this edge-on view of Saturn’s rings, capturing the moon Mimas above the ring plane, illuminated both by the sun and by “saturnshine,” the tiny moon Janus just above the rings and larger Tethys below. Cassini took the photo from a distance of about 2.7 million kilometres (1.7 million miles), combining red, green and blue spectral filters to produce a natural colour view. Cassini’s mission ended 15 September, 2017, when the spacecraft, virtually out of propellant after its long, successful mission, was directed to plunge into Saturn’s atmosphere.
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Saturn’s moons Janus and Tethys
Janus and Tethys demonstrate the main difference between small moons and large ones; it’s all about their shape. Moons like Tethys are large enough that their own gravity is sufficient to overcome the material strength of the substances they are made of and mould them into spherical shapes, but small moons like Janus are not massive enough for their gravity to form them into a sphere.
Cassini ready to dive deep into Saturn moon’s erupting water plume
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The mysterious ‘lakes’ on Saturn’s moon Titan
Titan is home to seas and lakes filled with liquid hydrocarbons, but what forms the depressions on the surface? A new study using data from the joint NASA and European Space Agency (ESA) Cassini mission suggests the moon’s surface dissolves in a process that’s similar to the creation of sinkholes on Earth.