14 November 2012, 01:10 PM ET
Saturn is the second largest planet in the solar system.
14 November 2012, 12:50 PM ET
Saturn is the farthest planet you can see with the naked eye.
14 November 2012, 12:44 PM ET
The gas giant is mostly atmosphere; it lacks a solid surface.
14 November 2012, 12:25 PM ET
Most of ringed planet's heat comes from within, rather than from the sun.
14 November 2012, 12:20 PM ET
The gas giant is mostly hydrogen and helium.
14 November 2012, 12:12 PM ET
Saturn was made, along with the other planets, out of the cloud of dust and gas known as the solar nebula.
12 November 2012, 12:41 PM ET
Mariner 9 changed our perceptions of the Red Planet.
08 November 2012, 04:55 PM ET
The mission rebooted NASA's exploration of the Red Planet, and launched a new strategy for building spacecraft.
07 November 2012, 06:24 PM ET
Jupiter is about 318 times as big as Earth.
07 November 2012, 06:10 PM ET
On Jupiter, temperature is dependent on the planet's interior, not the sun.
07 November 2012, 05:51 PM ET
Like all of the planets, Jupiter was formed out of the solar nebula.
07 November 2012, 05:17 PM ET
Jupiter is composed of gases — hydrogen and helium, mostly.
07 November 2012, 04:33 PM ET
The atmosphere of Jupiter has distinctive belts, bands and a massive swirling storm.
07 November 2012, 04:07 PM ET
The distance to Jupiter from Earth varies because of the planets' elliptical orbits.
07 November 2012, 12:19 PM ET
The New Horizons spacecraft is expected to reach the dwarf planet Pluto in 2015
06 November 2012, 02:02 PM ET
The European spacecraft has made some surprising discoveries.
01 November 2012, 04:02 PM ET
The orbiter has been snapping pictures of the Red Planet since 2006.
31 October 2012, 01:52 PM ET
The Mariner 10 spacecraft gave us the first close-up view of the sun's closest planet.
29 October 2012, 02:47 PM ET
Mars Odyssey is the longest-serving spacecraft to visit Mars.
26 October 2012, 12:10 PM ET
The Viking mission to Mars gave scientists their first look at the Martian landscape.
24 October 2012, 03:17 PM ET
Mars Express is the European Space Agency's first spacecraft to fly to another planet.
23 October 2012, 02:40 PM ET
The space shuttle Discovery flew 39 times into space, more than any spacecraft.
22 October 2012, 07:25 PM ET
The surface of the moon experiences great extremes in temperature, from boiling hot to freezing cold.
19 October 2012, 02:03 PM ET
The moon is about one-fourth as big as Earth, relatively large for a planet's satellite.
18 October 2012, 03:32 PM ET
Endeavour was the final addition to NASA's space shuttle fleet.
16 October 2012, 04:35 PM ET
Three stars in this system are the sun's nearest stellar neighbors.
16 October 2012, 01:21 PM ET
The space shuttle Challenger was one of NASA's greatest triumphs and also its darkest tragedy.
15 October 2012, 01:02 PM ET
The moon's atmosphere is a very thin layer of widely dispersed gases.
09 October 2012, 05:58 PM ET
Without going into space, the first space shuttle prepared astronauts for future missions.
08 October 2012, 02:02 PM ET
An overview of NASA HQ, which oversees the space agency's many science, exploration and spaceflight activities.
29 September 2012, 01:30 PM ET
Falcon 9 lifts SpaceX's Dragon spacecraft to the ISS.
28 September 2012, 04:59 PM ET
Explorer 1 launched the United States into the Space Race.