17 March 2015, 10:00 PM ET
For about 50 years, humanity has sent orbiters, probes and landers to the Red Planet. Here's a look at all of the missions to Mars to date, both the successes and the failures.
16 March 2015, 09:49 PM ET
Cosmologist Stephen Hawking is regarded as a brilliant theoretical physicist. His work on black holes and the big bang are topics of popular books.
13 March 2015, 06:31 PM ET
A look at the 18 men who flew on manned moon landing missions.
11 March 2015, 04:00 AM ET
A look at some of the records people have set during spaceflight.
09 March 2015, 04:05 PM ET
SpaceShipTwo should start flying paying customers into space sometime in 2015, Virgin Galactic founder Richard Branson has said.
06 March 2015, 08:13 AM ET
Entrepreneur Richard Branson aims to take paying passengers into space in the next few years.
03 March 2015, 07:19 PM ET
Comet 67P/Churyumov–Gerasimenko is a small body visited by the Rosetta spacecraft in the first mission to land on a comet.
19 February 2015, 10:39 PM ET
SpaceX is a private spaceflight company that regularly delivers payloads to the International Space Station via its Dragon spacecraft.
13 February 2015, 09:44 PM ET
The winged ship's heritage dates back to Soviet and NASA concepts from the 1980s.
11 February 2015, 08:06 PM ET
The aviation giant aims to take astronauts to the International Space Station in a capsule that is similar to Apollo spacecraft.
10 February 2015, 08:15 PM ET
Learn about the science behind the northern and southern lights.
09 February 2015, 10:20 PM ET
Europa is an icy moon of Jupiter and one of the four so-called Galilean moons.
04 February 2015, 09:45 PM ET
Titan is the only moon in the solar system with a thick atmosphere. See more Titan facts here.
02 February 2015, 10:10 PM ET
The sun's unceasing activity affects our planet beyond providing obvious light and heat.
30 January 2015, 04:32 PM ET
The Dragon spacecraft first reached the International Space Station in 2012.
30 January 2015, 04:11 PM ET
Pluto, the most famous dwarf planet, lost its planet status in 2006. Learn more about dwarf planets of the solar system here.
29 January 2015, 08:30 PM ET
Falcon 9 lifts SpaceX's Dragon spacecraft to the ISS.
29 January 2015, 08:09 PM ET
Vesta is the second largest asteroid in the solar system.
28 January 2015, 08:23 PM ET
The Opportunity rover is NASA's longest rover mission.
28 January 2015, 07:53 PM ET
Variable stars change brightness. But there are many reasons why.
27 January 2015, 09:51 PM ET
The New Horizons spacecraft is expected to reach the dwarf planet Pluto in 2015
27 January 2015, 02:17 AM ET
Eris, a distant world whose discovery led to Pluto's demotion to dwarf planet, was once proposed as the solar system's 10th planet.
26 January 2015, 11:59 PM ET
The orbiter has been snapping pictures of the Red Planet since 2006.
21 January 2015, 08:11 PM ET
NASA's Messenger mission has spent several years mapping Mercury, which was poorly understood for decades.
20 January 2015, 09:17 PM ET
Mars Odyssey is the longest-serving spacecraft to visit Mars.
15 January 2015, 10:02 PM ET
The European spacecraft made some surprising discoveries during its eight-year mission to the second planet from the sun.
14 January 2015, 10:57 PM ET
Scaled Composites has been aiming toward commercial spaceflight for more than a decade.
13 January 2015, 10:00 PM ET
The universe was born with the Big Bang as an unimaginably hot, dense point. SPACE.com offers an overview of the universe and its history, age and structure.
08 January 2015, 01:20 PM ET
The full moon happens once a month. Find out when.
08 January 2015, 12:45 PM ET
Find out the current moon phases. The moon cycles through eight phases every month.
31 December 2014, 11:50 AM ET
The Geminids come from an asteroid, 3200 Phaethon, but scientists are still trying to figure out exactly how it sheds enough debris to produce the bright meteor shower.
22 December 2014, 09:45 PM ET
Comet ISON, discovered by two amateur astronomers in Russia, arrived in Earth's neighborhood in November 2013 and apparently broke up as it rounded the sun.