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

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