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.
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.
28 January 2013, 12:04 PM ET
Alliant Techsystems (ATK) is working on a private spacecraft to bring astronauts to the International Space Station.
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.
18 January 2013, 05:44 PM ET
Jeff Bezos, who made his fortune as the founder of Amazon also began a space company focused on bringing humans into suborbit.
18 January 2013, 12:59 PM ET
Microsoft co-founder Paul Allen has provided funds for private spaceflight ventures, including Scaled Composites and Stratolaunch Systems.
17 January 2013, 05:22 PM ET
Material from the solar system's creation clumped together to form our closest star.
17 January 2013, 01:00 PM ET
Bigelow Aerospace's vision is to provide expandable modules for the International Space Station.
16 January 2013, 08:50 AM ET
Columbia was the first space shuttle to reach orbit, in 1981. It flew 28 times before disaster struck in 2003.
15 January 2013, 09:41 PM ET
He profoundly changed how we think about space and time.
15 January 2013, 05:27 PM ET
Astrium's project would send tourists to an altitude of 60 miles (100 km) above Earth.
15 January 2013, 03:44 PM ET
There are three theories as to how Earth's satellite could have been created.
14 January 2013, 06:57 PM ET
This site near Las Cruces, New Mexico, is being planned as a base for commercial spaceflight.
08 January 2013, 12:05 PM ET
Two theories explain the formation of Earth and other planets.
20 December 2012, 11:58 AM ET
Richard Branson, through his company Virgin Galactic, plans to offer flights into space for paying customers by 2015.
14 December 2012, 05:58 PM ET
The blue giant is the fourth largest planet in the solar system.
14 December 2012, 05:55 PM ET
The blue giant is the farthest planet from the sun.
14 December 2012, 05:46 PM ET
The faraway planet has some of the most extreme and violent weather in the solar system.
14 December 2012, 05:31 PM ET
The farthest planet from the sun is an ice giant.