06 April 2012, 10:46 AM ET
A looming shortage of the radioactive isotope worries many planetary scientists.
29 March 2012, 04:55 PM ET
The moons Enceladus, Janus and Dione shine in new pictures from Cassini.
27 March 2012, 05:58 PM ET
This cool space wallpaper shows Cassini spacecraft looks toward the dark side of Saturn's largest moon as a circle of light is produced by sunlight scattering through the periphery of Titan's atmosphere.
23 March 2012, 07:00 AM ET
Saturn's sixth largest moon, Enceladus, has long intrigued astronomers.
16 March 2012, 09:03 AM ET
During its slow fly-by of Jupiter, NASA's Cassini spacecraft captured imagery of wave motion in the fast-moving jet streams that are a signature of the gas giant.
16 March 2012, 07:00 AM ET
Scientists are hoping to understand how Saturn's moon Iapetus formed and evolved.
15 March 2012, 03:39 PM ET
The new images bring Rhea's battered surface into clear focus.
09 March 2012, 04:25 PM ET
Skywatchers can watch as Saturn, the moon and the bright star Spica move across the sky.
06 March 2012, 07:00 AM ET
The eruptions are caused by discontinuities in the solar wind.
05 March 2012, 02:36 PM ET
The image shows Saturn's iconic rings casting huge shadows across the planet.
29 February 2012, 01:01 PM ET
The method of examining the polarization of light could one day be used to spot signs of life on alien planets.
28 February 2012, 11:55 AM ET
The results point to increased velocities of the asteroids that bombarded the moon 4 billion years ago.
28 February 2012, 07:00 AM ET
The IceMole probe would be able to melt and drill through frigid Enceladus to hunt for alien life.
22 February 2012, 12:33 PM ET
NASA's New Horizons Pluto mission team is hoping for 100,000 signatures by March 13.
16 February 2012, 08:13 PM ET
The shot, from NASA's Cassini spacecraft, shows the moons Rhea and Titan.
15 February 2012, 07:00 AM ET
There's no room for multibillion-dollar exploration efforts in the current NASA budget.
09 February 2012, 07:23 PM ET
A brief look at the space agency's science and exploration highlights.
09 February 2012, 04:43 PM ET
Russian scientists have drilled 13,000 feet below Antarctica to the Lake Vostok, sealed off to the world for at least 14 million years, and if life can be found there, it may be possible in similar conditions on Europa and Enceladus.
08 February 2012, 03:20 PM ET
The moon will shine with venus, Saturn and the bright star Spica, while Mars makes a late-night appearance.
02 February 2012, 02:51 PM ET
Jupiter is a giant among the solar system planets. See photos of Jupiter from telescopes and visiting spacecraft.
01 February 2012, 04:36 PM ET
The petition hopes to collect 100,000 signatures by March 13.
31 January 2012, 03:15 PM ET
Saturn, Jupiter, Venus, Mars, and several prominent giant stars highlight a brilliant month in the night sky. Tonight's Sky for February 2012 shows how to see them all.
26 January 2012, 02:01 PM ET
Researchers are still unclear about what might have powered this ancient lunar magnetic field.
24 January 2012, 07:00 AM ET
Dunes on the huge moon vary according to latitude and elevation.
19 January 2012, 01:35 PM ET
New Horizons is zooming toward a close encounter with Pluto in 2015.
12 January 2012, 07:47 AM ET
The rings are around a potential planet, or even a star, 420 light-years away.
06 January 2012, 04:55 PM ET
A list of all of the full moon names of 2012, including how they originated.
02 January 2012, 07:00 AM ET
Scientists are testing technologies to one day explore the lakes of Titan.
30 December 2011, 07:00 AM ET
Researchers headed to Chile to test technologies for a possible mission to Saturn's moon Titan.
28 December 2011, 07:00 AM ET
The Cassini spacecraft captured shots of Titan, Dione and Enceladus.
27 December 2011, 01:34 PM ET
This stunning space wallpaper shows a close up of toward the south polar region of Saturn's largest moon, Titan.
22 December 2011, 04:30 PM ET
The pictures were snapped by NASA's Cassini and WISE spacecraft.
21 December 2011, 02:00 PM ET
Don't miss the seven major planets of the solar system in the night sky this week.
03 December 2011, 01:07 AM ET
From the photo of the birth of a solar system to the Curiosity mission launch, see the most amazing images from space this week.
02 December 2011, 01:35 PM ET
The new images reveal grooves in the moon's south polar region and unexpected textures in the surface ice.
02 December 2011, 09:48 AM ET
Using the synthetic-aperture radar (SAR) aboard NASA's Cassini spacecraft, the highest resolution imagery ever seen of parts of the Saturn moon have been created back to Earth. Imagery was snapped by the spacecraft on Nov 6, 2011.