Two New Moons Of Uranus Discovered (November 1, 1997) -- A team of astronomers has discovered two distant moons orbiting around the planet ... > full story

Huge Spring Storms Rouse Uranus From Winter Hibernation (April 1, 1999) -- If springtime on Earth were anything like it will be on Uranus, we would be experiencing waves of massive storms, each one covering the country from Kansas to New York, with temperatures of 300 ... > full story

Hubble Captures A Rare Eclipse On Uranus (September 2, 2006) -- A new Hubble Space Telescope image shows a never-before-seen astronomical alignment of a moon traversing the face of Uranus, and its accompanying shadow. The white dot near the center of Uranus' ... > full story

Hubble Uncovers Smallest Moons Yet Seen Around Uranus (September 26, 2003) -- Astronomers have discovered two of the smallest moons yet found around Uranus. The new moons, uncovered by NASA's Hubble Space Telescope, are about 8 to 10 miles across (12 to 16 km) about the size ... > full story

NASA's Hubble Discovers New Rings And Moons Around Uranus (December 23, 2005) -- NASA's Hubble Space Telescope photographed a new pair of rings around Uranus and two new, small moons orbiting the planet. The largest ring is twice the diameter of the planet's previously known ... > full story

25 Years Later, Voyager Mission Keeps Pushing The Space Envelope (August 19, 2002) -- A quarter-century after NASA's twin Voyager spacecraft departed Earth to visit outer planets, the historic mission is flying a race against ... > full story

Hubble Discovers Dark Cloud In The Atmosphere Of Uranus (October 2, 2006) -- Just as we near the end of the hurricane season in the Atlantic Ocean, winds whirl and clouds churn 2 billion miles away in the atmosphere of Uranus, forming a dark vortex large enough to engulf ... > full story

Astronomers Detect Shadow Of Water World In Front Of Nearby Star (May 16, 2007) -- A team of European astronomers has measured the transit of a Neptune-sized planet around another star. For the first time, the size and density of such a small extra-solar planet has been measured, ... > full story

Recipe For Neptune Revealed By Scientists (October 27, 2000) -- What do you get if you mix together one part helium and five-and-a-half parts hydrogen, add a dash of methane, heat to 60 Kelvins (-351 degrees F) and let sit for over four billion years? If you made ... > full story

Pioneering NASA Spacecraft Mark Thirty Years Of Flight (August 30, 2007) -- NASA's two venerable Voyager spacecraft are celebrating three decades of flight as they head toward interstellar space. Their ongoing odysseys mark an unprecedented and historic accomplishment. ... > full story

Jupiter-Like Planets Formed In Hundreds Not Millions Of Years, Study Shows (December 2, 2002) -- An accepted assumption in astrophysics holds that it takes more than 1 million years for gas giant planets such as Jupiter and Saturn to form from the cosmic debris circling a young star. But new ... > full story

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

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

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

Voyager program -- The Voyager program consisted of a pair of unmanned scientific probes, Voyager 1 and Voyager 2, launched in 1977. They were sent to study Jupiter and Saturn, using an advantageous planetary alignment ... > 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

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

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

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

Great Red Spot on Jupiter -- The Great Red Spot is a persistent anticyclonic storm on the planet Jupiter, 22 degrees south of the equator, which has lasted at least 340 years. The storm is large enough to be visible through ... > full article