31 July 2015, 03:00 PM ET
Find out what's up in your night sky during August 2015 and how to see it in this Space.com stargazing guide.
22 July 2015, 05:20 PM ET
Globular clusters are densely packed, spherical collections of ancient stars. They contain hundreds of thousands, and sometimes millions, of stars.
22 July 2015, 12:00 PM ET
Learn about the discovery of dwarf planet Pluto, its fascinating orbit and atmosphere and the controversy surrounding its planetary status.
22 June 2015, 09:47 PM ET
The Big Bang Theory is the leading explanation about how the universe began.
18 June 2015, 01:11 AM ET
The International Astronomical Union is an organization of professional astronomers and the recognized authority for assigning names to celestial objects.
02 June 2015, 01:59 AM ET
In aviation and in space, a drone refers to an unpiloted aircraft or spacecraft.
02 June 2015, 01:20 AM ET
Edwards Air Force Base is a U.S. military facility where cutting-edge aerospace technologies are tested.
30 May 2015, 04:53 AM ET
North American Aerospace Defense Command (NORAD) is a joint military organization of the United States and Canada that looks for threats in aerospace, patrols the skies for missiles and tracks the whereabouts of Santa Claus.
05 May 2015, 11:02 PM ET
Most of the stars in the universe are main sequence stars. The sun is a main sequence star.
05 May 2015, 11:25 AM ET
The Eta Aquarids are a meteor shower best visible from the Southern Hemisphere.
02 May 2015, 02:51 AM ET
The principles of rockets go back thousands of years, from powering whimsical toys to lifting humans into space.
01 May 2015, 02:14 AM ET
The XS-1 is a space plane under development by the U.S. military's high-tech agency, the Defense Advanced Research Projects Agency (DARPA).
30 April 2015, 12:46 AM ET
DARPA is an agency of the U.S. military that tests and develops new technologies.
24 April 2015, 07:31 PM ET
In a geosynchronous orbit, a satellite orbits Earth at the same speed as the planet is turning, enabling it to stay in place over a single location.
21 April 2015, 02:36 AM ET
The Buran spacecraft was a space shuttle developed by the Soviet Union in response to NASA's space shuttle program. It flew one time.
13 April 2015, 04:53 PM ET
A wormhole is a theoretical passage through space-time that could create shortcuts for long journeys across the universe.
10 April 2015, 09:36 PM ET
Albert Einstein determined that massive objects cause a distortion in space-time, which is felt as gravity.
09 April 2015, 05:47 PM ET
Black holes are some of the strangest and most mysterious objects in the universe.
07 April 2015, 11:00 AM ET
Lunar eclipses occur when Earth's shadow blocks the sun. There are three types; the most dramatic is a total lunar eclipse. Find out when is the next one.
31 March 2015, 04:49 PM ET
There used to be nine planets. Now there are eight. Whichever you prefer, here is a list of them in the order they appear in the solar system.
26 March 2015, 11:58 PM ET
The two-year mission of the one-ton rover is to find out if Mars is, or was, capable of supporting life.
25 March 2015, 01:00 PM ET
Total solar eclipses are one of nature’s grandest events. What is a total solar eclipse? How do they work? And when is the next one? We explain.
23 March 2015, 03:59 PM ET
Mars Express is the European Space Agency's first spacecraft to fly to another planet.
19 March 2015, 10:31 PM ET
The ISS is the most complex scientific and technological endeavor ever undertaken.
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.