04 December 2014, 05:10 PM ET
The way we define life has consequences for the search for life on other worlds such as Mars, Jupiter's moon Europa and the Saturn satellite Enceladus.
02 December 2014, 11:00 AM ET
With luck, skywatchers can catch sight of the five brightest planets in the sky this month. Mercury, Mars, Venus, Saturn and Jupiter should all be on display.
27 November 2014, 07:12 AM ET
Titan's "prebiotic" environment consists of molecules that could be a precursor to life.
25 November 2014, 05:14 PM ET
Neptune is the farthest planet from the sun and was the first to be predicted before it was discovered.
21 November 2014, 04:00 PM ET
See images of the ringed planet from NASA's Cassini spacecraft in orbit around Saturn.
21 November 2014, 10:40 AM ET
The morning sky will play host to a spectacular gathering of solar system objects grouped closely together tomorrow (Nov. 22), but it won't be easy for observers on Earth to see it.
21 November 2014, 07:00 AM ET
Binary Earth-size planets that orbit each other might exist around distant stars, researchers say. Simulations suggest such worlds can begin circling each other after slow, grazing collisions.
20 November 2014, 04:13 PM ET
A stunning new picture of Saturn's clouds shows swirls of mixing material, like cream whirling through coffee.
17 November 2014, 02:18 PM ET
The Great Red Spot on Jupiter's face is secretly dull in color. But the swirling storm looks crimson thanks to something like a cosmic "sunburn." Gases in Jupiter's upper atmosphere turn reddish when they're hit with sunlight, scientists say.
14 November 2014, 12:59 AM ET
Jupiter is the largest planet in our solar system, and is known for its many moons, its dangerous radiation belt and its iconic Great Red Spot.
11 November 2014, 07:46 AM ET
Get up early or stay out late to see some of the brightest planets in the night sky this month. The elusive planet Mercury begins November with its best morning apparition for 2014.
11 November 2014, 07:00 AM ET
Radar measurements made by NASA's Saturn-orbiting Cassini probe along a 25-mile-long (40 kilometers) stretch of Kraken Mare's eastern shore reveal depths ranging from 66 to 115 feet (20 to 35 m), researchers said.
05 November 2014, 01:14 PM ET
An amazing new photo taken by a NASA probe shows Saturn and its large moon Titan shining as pretty crescents in deep space.
28 October 2014, 07:00 AM ET
In a celestial surprise, NASA's Cassini spacecraft has identified clouds of methane ice high in the stratosphere of Saturn's huge
17 October 2014, 11:03 AM ET
A spacecraft exploring the Saturn system was zapped by static electricity sent out one of the ringed wonder's many moons in 2005, a new study suggests.
16 October 2014, 02:10 PM ET
There's something strange going on below the surface of Saturn's Death Star-looking moon Mimas, a new study suggests.
10 October 2014, 11:47 AM ET
Forget Saturn's rings. The jewel of the solar system has another stunning feature that only faraway spacecraft can see clearly: a hexagon-shaped vortex that's been swirling above Saturn's north pole for at least 30 years.
30 September 2014, 07:35 AM ET
See stunning photos of the cloud-covered Titan from NASA's Cassini spacecraft.
30 September 2014, 07:00 AM ET
NASA's Cassini spacecraft has spotted an odd islandlike feature in Ligeia Mare, one of Titan's largest hydrocarbon seas. Scientists don't know what to make of the structure, which covers about 100 square miles.
29 September 2014, 03:01 PM ET
The strange feature that appeared on the shoreline of Titan's Ligeia Mare sea was imaged by NASA's Cassini probe in July 2013 and again in August 2014. Full Story: http://goo.gl/BcRjYj
27 September 2014, 07:00 AM ET
For a couple of hours after nightfall Sunday (Sept. 28), Mars will be a fairly conspicuous light. The Red Planet will have a companion this evening; sitting below and to its left will shine the reddish 1st-magnitude star Antares.
26 September 2014, 07:00 AM ET
Currently the constellation Libra is host to the planet Saturn and two of the largest and brightest asteroids, Ceres and Vesta. In addition, the crescent moon will be passing through on its monthly trip around the Earth.
23 September 2014, 10:49 AM ET
NASA's New Horizons spacecraft may still be 10 months from its historic flyby with dwarf planet Pluto, but it is making good use of its interplanetary cruise to get familiar with its flyby target by imaging Pluto's outermost moon Hydra
23 September 2014, 07:30 AM ET
The image captures the Saturn moons Tethys, Hyperion and Prometheus,, along with the gas giant's iconic rings. Cassini took the picture on July 14, 2014, when it was about 1.2 million miles from Tethys, NASA officials saiD.
15 September 2014, 10:30 AM ET
NASA's twin Voyager spacecraft spotted many bright clumps in Saturn's F ring when they flew by the gas giant in the early 1980s.
02 September 2014, 05:03 PM ET
Electric sparks might have helped break down lunar soil, suggesting the moon may be significantly more active than previously thought. The phenomenon may take place throughout the solar system, from Mercury to the moons of Jupiter and Saturn.
02 September 2014, 10:53 AM ET
In the evening, Mars and Saturn can be seen in the southwestern sky. Jupiter can be viewed in the eastern sky in the early morning hours. Also, the Moon adds additional light for farmers to harvest their crops.
30 August 2014, 09:03 AM ET
Look up this Labor Day weekend to see a lovely celestial tableau in the southwestern part of the evening sky.
22 August 2014, 06:00 AM ET
Scientists discuss what makes Jupiter's moon Europa perhaps the solar system's best bets for hosting life beyond Earth.
20 August 2014, 12:45 PM ET
Boring through ½ mile rock-hard Antarctic ice, researchers discover a completely isolated community of microorganisms living in Subglacial Lake Whillans. The finding could be an analog for subsurface life on Mars, Europa, Enceladus and other worlds.
13 August 2014, 07:00 AM ET
Cassini looked on last month as methane clouds floated above Ligeia Mare, a big hydrocarbon sea near Titan's north pole. Few clouds had been seen on Titan since 2010, so researchers are trying to gauge the significance of the new observations.
12 August 2014, 04:11 PM ET
The international Cassini-Huygens mission scanned a gathering cloud mass over the methane sea known as Ligeia Mare on Saturn’s largest moon Titan between July 20th and 22nd 2014. Full Story: http://goo.gl/gIb2r9
03 August 2014, 06:34 PM ET
Saturn and Earth's nearest neighbor will perform a celestial dance on Monday (Aug. 4), when the moon will eclipse the ringed planet for stargazers in Australia, but you don't have to go Down Under to catch the event. You can see it live online.
31 July 2014, 02:48 PM ET
Mars and Saturn get together with the crescent moon for a planetary 3-way on August 31st and Venus and Jupiter get together on August 18th. The Perseids Meteor Shower peaks on Aug 11-13.
29 July 2014, 07:17 AM ET
The icy Saturn moon Enceladus sports at least 101 geysers, which reach all the way down to the satellite's subsurface ocean, new research suggests.
04 July 2014, 07:00 AM ET
The subsurface ocean inside Saturn’s largest moon, Titan, could be as salty as any body of water here on Earth, a new study reports. Data collected by NASA's Cassini mission suggests Titan's ocean is as salty as the Dead Sea.