28 September 2012, 03:31 PM ET
Perhaps as old as the Solar System itself, Ganymede – the largest moon of any planet – is the only moon known to have a magnetic field.
28 September 2012, 03:12 PM ET
Locked beneath the icy surface of Europa is perhaps as much water as in all of Earth's oceans and lakes. But could there be life in the salty underground global sea?
28 September 2012, 11:16 AM ET
The rings of Saturn have captured human curiosity for centuries. But they aren't the only fascinating mysteries surrounding the sixth planet from the sun.
27 September 2012, 01:57 PM ET
By far the most massive planet in our solar system, Jupiter features giant hurricanes, auroras, abstract artistic cloudswirls, and maybe even a solid core. It also protects Earth by gravitationally clearing the solar system of asteroids and comets.
24 September 2012, 06:01 PM ET
Future missions hoping to explore Europa's ocean may have to dig very deep.
17 September 2012, 12:08 PM ET
Now's your chance to see Saturn before it disappears for a while.
14 September 2012, 02:00 PM ET
These real planets, moons and asteroids match anything imagined by George Lucas for the "Star Wars" universe.
13 September 2012, 12:29 PM ET
Many alien planets likely dip in and out of their stars' "habitable zones."
05 September 2012, 05:37 PM ET
Voyager 1's rocket only had 3.5 seconds of fuel left when it sent the probe on its way 35 years ago.
04 September 2012, 11:50 AM ET
This September skywatchers can catch a glimpse of four planets (Venus, Mars, Jupiter, and Saturn) as well as a visual trick in the constellation Capricornus that makes two stars look like one oddly enlongated star.
30 August 2012, 11:40 AM ET
Saturn's rings obscure part of Titan's colorful visage in this space wallpaper from NASA's Cassini spacecraft.
30 August 2012, 07:00 AM ET
Cassini snapped the pictures, which were released Wednesday.
24 August 2012, 08:00 AM ET
President Kennedy gets a lesson in how the Saturn Launch System works.
20 August 2012, 04:57 PM ET
InSight will attempt to unlock the secrets of Mars' interior.
05 August 2012, 08:01 AM ET
Saturn, Mars and the bright star Spica will form a triangle in the night sky.
03 August 2012, 09:34 AM ET
Mars, Saturn and the bright star Spica will form a tight triangle in the western sky on August 5th that will be visible after sunset. The Mars Science Laboratory is set to land on the Red Planet at 1:31am (EDT) on August 6th, 2012.
01 August 2012, 12:19 PM ET
This cool space wallpaper reveals a quartet of Saturn's moons, from tiny to huge, surround and are embedded within the planet's rings in this Cassini composition.
01 August 2012, 11:20 AM ET
Curiosity makes its anticipated landing and for most of the month, Saturn and the bright star Spica will form a skywatching trio with the Red Planet - making them easy to spot. Dozens of meteors will light up sky in the annual Perseid Meteor Shower.
29 July 2012, 06:40 AM ET
Some landslides on Saturn's icy moon, Iapetus, travel 10 to 15 times farther than scientists expected.
23 July 2012, 07:00 AM ET
The hazy moon Titan has a puzzling geological past, according to a new study.
18 July 2012, 08:00 AM ET
A Titan rocket from the Gemini family prepares to deliver the Viking toward Mars.
13 July 2012, 10:34 AM ET
After a two-year drought, Saturn's rings shine in dazzling photos once more.
13 July 2012, 07:00 AM ET
How much do you know about our solar system's major ring bearer?
12 July 2012, 02:02 PM ET
On July 15th, 2012, Earth's Moon will occult Jupiter and its four largest moons – Europa, Io, Callisto and Ganymede – blocking them from skywatchers' views.
11 July 2012, 01:33 PM ET
Dwarf planet Pluto has one giant moon, Charon, but now is known to have four more tiny satellites.
10 July 2012, 06:27 PM ET
The atmospheric feature could herald the start of winter in Titan's south.
10 July 2012, 04:48 PM ET
NASA's Cassini spacecraft captured images of a revolving mass of gas in the atmosphere over Titan's southern pole. This odd cloud group completed a full rotation in 9 hours – quicker that the moon's 16-day rotation period.
06 July 2012, 05:13 PM ET
From July through August, planet groupings in the pre-dawn and dusk skies will impress skywatchers around the world.
06 July 2012, 10:42 AM ET
This cool space wallpaper, a particularly strong jet stream churns through Saturn's northern hemisphere in this false-color view from NASA's Cassini spacecraft.
28 June 2012, 02:01 PM ET
The subsurface sea could contain water, and maybe even life.
27 June 2012, 07:01 AM ET
This week's night sky offers a special trio of treats.
25 June 2012, 05:36 PM ET
In constrast, jet streams on Earth derive their energy from the sun.
20 June 2012, 08:00 AM ET
During the first test of the Titan-Centaur rocket, the Centaur stage failed to ignite.
14 June 2012, 10:56 AM ET
Cassini spacecraft looks toward Titan and its dark region called Shangri-La in this stunning space wallpaper.
13 June 2012, 01:01 PM ET
The tropical lake on Titan is the size of Utah's Great Salt Lake in the United States.
24 May 2012, 06:44 AM ET
NASA's Cassini probe is preparing to tilt its orbit around Saturn dramatically.