16 April 2013, 02:08 PM ET
Ken Mattingly missed his ride on Apollo 13, but made it to the moon on Apollo 16. He also commanded two shuttle missions.
12 April 2013, 02:29 PM ET
With a giant crater covering much of its surface, Mimas resembles a real-life Death Star from the "Star Wars" movies.
09 April 2013, 01:53 PM ET
Rhea, Saturn's second-largest moon, has a wispy oxygen atmosphere.
08 April 2013, 06:15 PM ET
David Scott's mission to the moon focused on science and featured the first lunar road trip.
08 April 2013, 06:10 PM ET
Jim Irwin wanted to fly to the moon since he was a child. Aboard Apollo 15, he made it.
08 April 2013, 06:01 PM ET
Al Worden's discovery that he liked to fly planes led him to becoming an astronaut and piloting the Apollo 15 command module.
05 April 2013, 06:25 PM ET
The tiny moon Enceladus is one of the most promising potential sites for hosting life in the solar system.
04 April 2013, 02:53 PM ET
Pete Conrad overcame dyslexia to become one of NASA's most-traveled astronauts, logging four trips into space, including Apollo 12.
04 April 2013, 02:49 PM ET
Alan Bean walked on the moon during Apollo 12. He turned to painting to chronicle his experiences.
04 April 2013, 02:44 PM ET
Richard F. "Dick" Gordon orbited the moon on Apollo 12. Earlier, he helped astronauts learn how to spacewalk.
02 April 2013, 03:52 PM ET
A collision may have spun Saturn's fourth moon around 180 degrees.
29 March 2013, 06:17 PM ET
This 2,500-mile system is one of the larger canyons in the solar system.
27 March 2013, 07:00 PM ET
The two small bodies that orbit the red planet raise a number of questions about the formation of the early solar system.
26 March 2013, 03:11 PM ET
Ed Mitchell's experience aboard Apollo 14 launched his exploration of the nature of human consciousness.
26 March 2013, 03:02 PM ET
Stuart Roosa's skills were put to the test when a docking mechanism didn't work.
21 March 2013, 06:52 PM ET
The moon's orbit brings it 6 feet closer to the red planet every century.
21 March 2013, 06:48 PM ET
Deimos' radius is only 3.9 miles. The tiny moon zips around Mars in only 30 hours and is so close to its parent planet that it was missed for centuries.
20 March 2013, 03:27 PM ET
Jim Lovell was for years NASA's most-traveled astronaut. He flew on four missions, including Apollo 13, whose crew had to survive in space after a crippling explosion.
20 March 2013, 03:22 PM ET
Jack Swigert survived the perilous Apollo 13 mission, then took a different kind of risk: entering politics.
20 March 2013, 03:03 PM ET
Astronaut Fred Haise was assigned to two Apollo missions where he would have walked on the moon, but he never made it there.
12 March 2013, 01:30 PM ET
Missions to Mars have searched, but haven't found definite proof of life past or present.
08 March 2013, 05:00 PM ET
Millions of pieces of space junk swarm around the Earth.
08 March 2013, 04:57 PM ET
Olympus Mons rises 16 miles above the Martian surface, making it the solar system's tallest volcano.
07 March 2013, 06:00 PM ET
Wernher von Braun led the development of the rockets that carried the first Americans into space and onto the moon.
06 March 2013, 05:18 PM ET
Comet Elenin was a minor comet that caused major doomsday rumors on Earth, even after it broke up after a solar storm.
04 March 2013, 07:03 PM ET
Hermann Oberth's ideas about missiles and space travel make him one of three "fathers of rocketry."
01 March 2013, 03:25 PM ET
Comet Hartley 2, discovered in 1986, has an odd shape, spins on two axes and spews out a jets of water and carbon dioxide.
28 February 2013, 06:35 PM ET
Comet Hyakutake's long tail astounded skywatchers when it approached Earth in 1996.
27 February 2013, 06:19 PM ET
Tsiolkovsky developed insights into space travel and rocket science that are still in use over a hundred years later.
25 February 2013, 12:41 PM ET
Goddard, the American father of modern rocketry, built and tested the world's first liquid-fuel rocket.
22 February 2013, 06:43 PM ET
Comet Hale-Bopp put on a spectacular show when it swung around the sun in the late 1990s.
22 February 2013, 11:24 AM ET
The Milky Way is a barred spiral galaxy, about 100,000 light-years across. We live on one of its minor spurs, the Orion Arm.