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.
01 March 2013, 06:02 AM ET
SpaceX, founded by Elon Musk, regularly delivers payloads to the International Space Station.
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.
20 February 2013, 02:17 PM ET
The comet's frequent recurrence has played a part in historical events for millennia.
19 February 2013, 02:35 PM ET
When comet Shoemaker-Levy 9 smashed into Jupiter in 1994, it sent ripple effects both physically and politically.
19 February 2013, 10:50 AM ET
In the 1500s, when most believed Earth was the center of the universe, Nicolas Copernicus proposed his theory that the planets revolved around the sun.
15 February 2013, 03:05 PM ET
Kansas farm boy Clyde Tombaugh looked to the stars and found a new planet.
14 February 2013, 04:24 PM ET
The Navstar constellation of satellites provides the signals for a global positioning system.
13 February 2013, 04:56 PM ET
Percival Lowell's study of Mars, while flawed, fueled public enthusiasm for the Red Planet.
12 February 2013, 05:47 PM ET
The twin Telstar satellites not only ushered in a new era of satellite communication, but also inspired a hit song.
11 February 2013, 10:31 AM ET
Landsat is a series of satellites that observe conditions on Earth.
08 February 2013, 05:47 PM ET
Black holes are some of the strangest and most mysterious objects in the universe.
05 February 2013, 04:33 PM ET
The Soviet Union's Mir space station – later operated by Russia – served as an important test bed for how missions should be run over several months.
04 February 2013, 02:37 PM ET
Tycho Brahe made many significant contributions to astronomy.
01 February 2013, 06:40 PM ET
Skylab represented the United States' first effort at long human space missions.
01 February 2013, 10:00 AM ET
The space shuttle Columbia broke up on Feb. 1, 2003, killing its seven-member crew. An investigation led to changes in NASA procedures.
31 January 2013, 06:57 PM ET
The company, funded by Amazon.com founder Jeff Bezos, is quietly working to bring astronauts to and from the International Space Station.
31 January 2013, 06:28 PM ET
The moon's surface tells the story of the solar system's beginnings.
30 January 2013, 02:18 PM ET
The winged ship's heritage dates back to Soviet and NASA concepts from the 1980s.
29 January 2013, 02:15 PM ET
NASA plans the first unmanned test flight of Orion in 2014.
28 January 2013, 12:04 PM ET
Alliant Techsystems (ATK) is working on a private spacecraft to bring astronauts to the International Space Station.
24 January 2013, 07:32 AM ET
The Opportunity rover is NASA's longest rover mission.
23 January 2013, 03:57 PM ET
Scaled Composites has been aiming toward commercial spaceflight for more than a decade.
23 January 2013, 03:40 PM ET
Burt Rutan envisioned a different way of launching vehicles into space.
23 January 2013, 01:34 PM ET
The sun's atmosphere has three layers: the photosphere, the chromosphere and the corona.
21 January 2013, 06:39 PM ET
The aviation giant aims to take astronauts to the International Space Station in a capsule that is similar to Apollo spacecraft.