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.
31 October 2012, 01:52 PM ET
The Mariner 10 spacecraft gave us the first close-up view of the sun's closest planet.
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.
28 September 2012, 04:59 PM ET
Explorer 1 launched the United States into the Space Race.
28 September 2012, 12:29 PM ET
The average temperature is 61 F (16 C), but temperatures vary greatly around the world.
28 September 2012, 02:37 AM ET
A timeline of notable spaceflight events across five decades of exploration.
26 September 2012, 06:14 PM ET
Pioneer 11 revealed the gas giants in unprecedented detail.
26 September 2012, 02:23 PM ET
Earth has multiple layers, consisting of the core, mantle and crust.
25 September 2012, 06:55 PM ET
What was the first animal in space? The answer may have you buzzing.
25 September 2012, 01:35 PM ET
The mission is still sending back data and fueling new discoveries.
24 September 2012, 06:47 PM ET
The Mars Pathfinder mission included the first successful rover on
21 September 2012, 01:04 PM ET
When the sun shucks off its outer layers, it will leave a beautiful cloud of gas.
20 September 2012, 06:44 PM ET
A brief look at "America's spaceport," which is in a period of transition after the space shuttle's 2011 retirement.
20 September 2012, 01:40 PM ET
Voyager 2 is the only spacecraft to have visited all four giant outer planets in the solar system.
19 September 2012, 06:52 PM ET
Earth is the only planet in the solar system with an atmosphere that can sustain life.