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Saturn -- Saturn is the sixth planet from the Sun. It is a gas giant, the second-largest planet in the solar system after Jupiter. Saturn has a prominent system of rings, consisting of mostly ice particles ... > full article

Saturn's natural satellites -- Saturn is currently known to have 56 moons, many of which were discovered very recently, and 3 additional un-confirmed, hypothetical moons. However, a precise number of moons can never be given, as ... > full article

Titan (moon) -- Titan, or Saturn VI, is the largest moon of Saturn and the second largest moon in the solar system, after Jupiter's moon Ganymede. It is roughly 50% larger than Earth's moon by diameter, and is ... > full article

Neptune's natural satellites -- Neptune has 13 known moons. The largest by far is Triton, discovered by William Lassell just 17 days after the discovery of Neptune itself. It took a hundred years to discover the second, Nereid. ... > full article

Uranus' natural satellites -- Uranus has 27 known moons. The first two moons (Titania and Oberon) were discovered by William Herschel on March 13, 1787. Two more moons (Ariel and Umbriel) were discovered by William Lassell in ... > full article

Dysnomia (moon of Eris) -- Dysnomia, is a moon of the dwarf planet Eris. The satellite is about 60 times fainter than Eris, and its diameter is estimated to be approximately eight times smaller. Astronomers now know that three ... > full article

Gas giant -- A gas giant is a large planet that is not primarily composed of rock or other solid matter. Gas giants may have a rocky or metallic core—in fact, such a core is thought to be required for a gas giant ... > full article

Equatorial bulge -- An equatorial bulge is a planetological term which describes a bulge which a planet may have around its equator, distorting it into an oblate spheroid. Because of a planet's equatorial bulge, its ... > full article

Multistage rocket -- A multistage (or multi-stage) rocket is, like any rocket, propelled by the recoil pressure of the burning gases it emits as it burns fuel. What characterizes it as "multi-stage" is that it ... > full article

Neptune -- Neptune is the eighth and outermost planet in our solar system. It is the fourth-largest planet by diameter and the third-largest by mass; Neptune is 17 times the mass of Earth and is slightly more ... > full article

Jupiter -- Jupiter is the fifth planet from the Sun and by far the largest within the solar system. Jupiter is usually the fourth brightest object in the sky (after the Sun, the Moon and Venus); however at ... > full article

Volcano -- A volcano is an opening (or rupture) in the Earth's surface or crust, which allows hot, molten rock, ash, and gases to escape from deep below the surface. Volcanic activity involving the extrusion of ... > full article

Jupiter's moons -- Jupiter has 63 known natural satellites. Although claims are made for the observation of one of Jupiter's moons by Chinese astronomer Gan De in 364 BC, the first certain observations of Jupiter's ... > full article

Uranus -- Uranus is the seventh planet from the Sun. It is a gas giant, the third largest by diameter and fourth largest by mass. NASA's Voyager 2 is the only spacecraft to have visited the planet and no other ... > full article

Deimos (moon) -- Deimos is probably an asteroid that was perturbed by Jupiter into an orbit that allowed it to be captured by Mars, though this hypothesis is still in some dispute. Like most bodies of its size, ... > full article

Definition of planet -- The definition of "planet" has for some time been the subject of intense debate. Although the word dates back thousands of years, no officially decreed scientific definition of "planet" existed ... > full article

Asteroid belt -- The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. Despite popular imagery, the ... > full article

Solar system -- The Solar System comprises the Sun and the retinue of celestial objects gravitationally bound to it: the eight planets, their 162 known moons, three currently identified dwarf planets and their four ... > full article

Impact crater -- An impact crater is a circular depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteor) with the ... > full article

Planet -- The International Astronomical Union defines "planet" as a celestial body that, within the Solar System that is in orbit around the Sun; has sufficient mass for its self-gravity to overcome rigid ... > full article

 

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Summaries | Headlines

Cassini Images Bizarre Hexagon On Saturn (March 27, 2007) -- An odd, six-sided, honeycomb-shaped feature circling the entire north pole of Saturn has captured the interest of scientists with NASA's Cassini ... > full story

Tiny Enceladus Masks Mighty Saturn's Clock (March 26, 2007) -- New data from NASA's Cassini spacecraft, reported in the online version of Science, shows how the small moon, Enceladus, is weighing down Saturn's magnetic field so much that the field is rotating ... > full story

Seas Discovered On Saturn's Moon Titan (March 14, 2007) -- Instruments on NASA's Cassini spacecraft have found evidence for seas, likely filled with liquid methane or ethane, in the high northern latitudes of Saturn's moon Titan. One such feature is larger ... > full story

Hot Start Might Explain Geysers On Enceladus (March 14, 2007) -- A hot start billions of years ago might have set into motion the forces that power geysers on Saturn's moon ... > full story

Cassini Returns Never-before-seen Views Of The Ringed Planet (March 2, 2007) -- NASA's Cassini spacecraft has captured never-before-seen views of Saturn from perspectives high above and below the planet's rings. Over the last several months, the spacecraft has climbed to higher ... > full story

Saturn's Moon Enceladus Is A 'Cosmic Graffiti Artist,' Astronomers Discover (February 14, 2007) -- Astronomers from the University of Virginia and other institutions have found that Enceladus, the sixth-largest moon of Saturn, is a "cosmic graffiti artist," pelting the surfaces of at least 11 ... > full story

Cassini Images Mammoth Cloud Engulfing Titan's North Pole (February 5, 2007) -- A giant cloud half the size of the United States has been imaged on Saturn's moon Titan by the Cassini spacecraft. The cloud may be responsible for the material that fills the lakes discovered last ... > full story

Surprises Continue Two Years After Probe's Landing On Saturn's Moon Titan (January 17, 2007) -- Two years ago, planetary scientists across the world watched as Europe and the US did something amazing. The Huygens descent module drifted down through the hazy atmosphere of Saturn's moon Titan, ... > full story

Liquid Lakes On Saturn's Titan (January 4, 2007) -- The existence of oceans or lakes of liquid methane on Saturn's moon Titan was predicted more than 20 years ago. But with a dense haze preventing a closer look it has not been possible to confirm ... > full story

Massive Mountain Range Imaged On Saturn's Moon Titan (December 13, 2006) -- The tallest mountains ever seen on Titan -- coated with layers of organic material and blanketed by clouds -- have been imaged by NASA's Cassini ... > full story

Monster Storm On Saturn Spotted By Cassini Space Probe (November 10, 2006) -- NASA's Cassini spacecraft has seen something never before seen on another planet -- a hurricane-like storm at Saturn's South Pole with a well-developed eye, ringed by towering clouds. The "hurricane" ... > full story

Saturn's Rings Show Evidence Of A Modern-Day Collision (October 13, 2006) -- Scientists with NASA's Cassini mission have spied a new, continuously changing feature that provides circumstantial evidence that a comet or asteroid recently collided with Saturn's innermost ring, ... > full story

< more recent summaries | earlier summaries >

Atlas of the Moon
The definitive Moon atlas is back! Revised, updated, and improved with expanded text and maps, this venerable atlas is the ideal reference guide for beginning Moon-gazers and expert lunar observers ... > read more

Prentice Hall Molecular Model Set For Organic Chemistry (2nd Edition)
This kit enables users to build virtually all simple molecules encountered in organic chemistry. Includes space-filling models that simulate the true shape of saturated compounds. Provides open ... > read more

Tactics of the Crescent Moon: Militant Muslim Combat Methods
Tactics of the Crescent Moon comes none too soon for deployed U.S. service personnel. Little, if any, of their battlefield intelligence has been tactically interpreted. U.S. analysts are generally ... > read more

First Man : The Life of Neil A. Armstrong
On July 20, 1969, the world stood still to watch thirty-eight-year-old American astronaut Neil A. Armstrong become the first person ever to step on the surface of another heavenly body. Perhaps no ... > read more

The Happiness Hypothesis
An award-winning psychologist exposes traditional wisdom to the scrutiny of science to show why ancient insights still help us live more meaningful-and healthy-lives Your grandmother was smarter ... > read more

 
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