Scientists Discover Ganymede has a Lumpy Interior
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Jet Propulsion Lab -- Scientists have discovered irregular lumps beneath the icy surface of Jupiter's largest moon, Ganymede. These irregular masses may be rock formations, supported by Ganymede's icy shell for billions of years...
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By Eric Hand  ST. LOUIS - A decade ago, NASA's Galileo probe made a stupendous discovery: A vast, warm, salty ocean - bigger than all of Earth's put together - under the icy crust of Europa, one of Jupiter's four large moons.  Ever since, William McKinnon has been chafing to go back.
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With a new spacecraft bound for Mercury, that tiny planet&nbsp;near the heart of the solar system, researchers are hoping to solve a slew of riddles about the small world.
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Saturn's majestic ring system, visible through backyard telescopes, just got a little more crowded with the discovery of a faint, new ring encircling the giant planet, scientists said Tuesday.
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The surface of one of the brightest stars in the night sky is imaged by scientists.
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Astronomers said they were baffled about how the planet, located 450 light-years away in the constellation Lacerta, formed and why it appears puffy.
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By ALICIA CHANG  SAN FRANCISCO - Detailed observations from the first comet samples returned to Earth are debunking some of science's long-held beliefs on how the icy, celestial bodies form.
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NASA's Opportunity Mars rover has come across  an interesting object&nbsp;-- perhaps a meteorite sitting out in the open at Meridiani  Planum. Initial data taken by the robot's Mini-Thermal Emission Spectrometer  (Mini-TES) is suggestive that the odd-looking rock is made of  metal.
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One pole of the sun is cooler than the other. That's the surprising conclusion announced today by scientists who have been analyzing data from the ESA-NASA Ulysses spacecraft.
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Scientists have gotten their best look ever at the composition of planets outside our solar system, but were more surprised by what they didn't see than what they did see.
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Â· Dwarf planet is not even the biggest of its type Â· Eris, body that reopened debate, is heavier
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Astronomers using NASA's Hubble Space Telescope have photographed one of the smallest objects ever seen around a normal star beyond our Sun. Weighing in at 12 times the mass of Jupiter, the object is small enough to be a planet.
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The Messenger spacecraft that zipped past Mercury two weeks ago found more evidence of the innermost planetâs turbulent past.
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Scientists said on Thursday they   have spotted an unusually large and light planet orbiting a   distant star -- a discovery that could force them to reexamine   theories about how planets are formed.
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A flyby by a Nasa unmanned space probe has revealed evidence of "widespread" volcanism on the planet Mercury.
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Calling Cassini&#39;s flyby &quot;the tale of two moons,&quot; imaging scientist Carolyn Porco said that &quot;one of them has been like out of a Lewis Carroll story and gets curiouser and curiouser the more we look at it and the closer we get, and the other turns out to be
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Saturn's moon Titan is covered by "dirty" ice ridges and seas of liquid natural gas, a team of scientists said on Friday after a week of research into data from the space probe Huygens.