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Explanation: Soft hues, partially lit orbs, a thin trace of the ring, and slight shadows highlight this understated view of the majestic surroundings of the giant planet Saturn. Looking nearly back toward the Sun, the robot Cassini spacecraft now orbiting Saturn captured crescent phases of Saturn and its moon Rhea in color a few years ago. As striking as the above image is, it is but a single frame from a 60-frame silent movie where Rhea can be seen gliding in front of its parent world. Since Cassini was nearly in the plane of Saturn's rings, the normally impressive rings...

Explanation: Orbiting in the plane of Saturn's rings, Saturnian moons have a perpetual ringside view of the gas giant planet. Of course, while passing near the ring plane the Cassini spacecraft also shares their stunning perspective. The thin rings themselves slice across the middle of this Cassini snapshot from April 2011. The scene looks toward the dark night side of Saturn, in the frame at the left, and the still sunlit side of the rings from just above the ringplane. Centered, over 1,500 kilometers across, Rhea is Saturn's second largest moon and is closest to the spacecraft, around 2.2 million...

Nasa's Cassini probe has scooped oxygen from the thin atmosphere of Rhea – the first time the gas has been detected directly on another worldA spacecraft has tasted oxygen in the atmosphere of another world for the first time while flying low over Saturn's icy moon, Rhea. Nasa's Cassini probe scooped oxygen from the thin atmosphere of the planet's moon while passing overhead at an altitude of 97km in March this year. Until now, wisps of oxygen have only been detected on planets and their moons indirectly, using the Hubble space telescope and other major facilities.

There is something around the moon of Rhea. It's not a ring, and it sure is weird, say researchers.Back in 2005, a suite of six instruments on the Cassini spacecraft detected what was thought to be an extensive debris disk around Saturn's moon Rhea, and while there was no visible evidence, researchers thought that perhaps there was a diffuse ring around the moon. This would have been the first ring ever found around a moon. New observations, however, have nixed the idea of a ring, but there's still something around Rhea that is causing a strange, symmetrical structure in the...

Male Bird At Smithsonian's National Zoo Has Special Reason To Celebrate Father's DayTwo of the four new rhea chicks at the Smithsonian's National Zoo nest in the feathers of their father. The chicks hatched on April 20 and were the first rhea chicks to hatch at the National Zoo in 30 years. Dedicated fathers, it is the male rhea who incubates the eggs and protects the chicks after they hatch. The Zoo is now home to a total of seven rheas: a male, two females, and the four new chicks. (Credit: Copyright Mehgan Murphy/Smithsonian’s National Zoo) ScienceDaily (Jun. 15, 2008)...

PASADENA, Calif. - New observations by a spacecraft suggest Saturn's second-largest moon may be surrounded by rings. If confirmed, it would the first time a ring system has been found around a moon. The international Cassini spacecraft detected what appeared to be a large debris disk around the 950-mile-wide moon Rhea during a flyby in 2005. Scientists proposed that the halo likely contained particles ranging from the size of grains to boulders. The finding was described in a study published in the March 7 issue of the journal Science. Unlike the rings around Saturn, Jupiter, Uranus and Neptune, the apparent...

Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2003 June 8 Rhea: Saturn's Second Largest Moon Credit: Voyager, NASA; Copyright: Calvin J. Hamilton Explanation: Rhea is the second largest moon of Saturn, behind Titan, and the largest without an atmosphere. It is composed mostly of water ice, but has a small rocky core. Rhea's rotation and orbit are locked together (just like Earth's Moon) so that one side always faces Saturn. A consequence of this is...

Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2003 January 10 The Crab that Played with the Planet Credit & Copyright: Ron Wodaski, Newastro Remote Telescope at New Mexico Skies Explanation: Wandering through the constellation Taurus, Saturn made its closest approach to planet Earth last month, tilting its lovely rings toward appreciative skygazers while rising high in midnight skies. On January 4th and 5th, Saturn also crossed in front of the high and far-off Crab Nebula...