Reference Pages
29 May 2015, 12:00 PM ET
Find out what's up in your night sky during June 2015 and how to see it in this Space.com stargazing guide.
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.
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.
06 February 2015, 05:40 PM ET
Watching a meteor shower on a clear, dark night is an unforgettable experience.
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.