01 October 2013, 06:35 PM ET
Acrux is made up of three stars, and a possible fourth that lies close by.
30 September 2013, 09:07 PM ET
Weightlessness, or the absence of gravity, has several short-term and long-term effects on astronauts.
30 September 2013, 03:50 PM ET
This month's night sky is full of cosmic wonders, including the equinox and planets galore. Find out what's up in your night sky and how to see it in this SPACE.com stargazing guide.
27 September 2013, 05:09 PM ET
Adhara is a bright binary star in Canis Major that shows up best in ultraviolet light.
27 September 2013, 01:39 AM ET
Hadar is a binary-star system in the Southern Hemisphere. Its stars may go supernova in the future.
26 September 2013, 05:04 PM ET
Mars has water trapped in the polar ice caps. More water may lie just beneath the surface.
26 September 2013, 01:04 AM ET
Fomalhaut has a planet that rose from the dead, as well as a vast number of comets that crash into each other daily.
24 September 2013, 05:03 PM ET
Procyon is a binary system, with a main-sequence larger star and a smaller white dwarf star orbiting each other.
24 September 2013, 02:53 PM ET
Comet ISON, discovered by two amateur astronomers in Russia, will arrive in Earth's neighborhood in November 2013.
23 September 2013, 08:24 PM ET
Deneb, one of the three stars of the Summer Triangle, anchors the tail of Cygnus the Swan.
20 September 2013, 09:52 PM ET
20 September 2013, 09:29 PM ET
Regulus is a bright star in the northern sky that has at least two known stellar companions.
19 September 2013, 06:16 PM ET
Rigel is the brightest star in Orion, and will eventually explode into a supernova, most astronomers say.
18 September 2013, 07:39 PM ET
Canopus is the second-brightest star in the night sky despite its distance from Earth.
17 September 2013, 10:36 PM ET
Arcturus is a red giant that is one of the brightest stars in Earth's night sky.
16 September 2013, 03:46 PM ET
Orbital Sciences Corp. is slated to be the second private American company to dock a spacecraft with the International Space Station.
12 September 2013, 04:01 PM ET
Voyager 1 is farther away than any other spacecraft from Earth.
10 September 2013, 08:22 PM ET
The China National Space Administration coordinates space activities in the country. It has launched several people into space and deployed a small space station, called Tiangong-1.
09 September 2013, 08:10 PM ET
Roscosmos, formed in 1992, came after decades of Soviet experience in space. Roscosmos is a large contributor to the International Space Station.
05 September 2013, 09:14 PM ET
The Japanese Aerospace Exploration Agency does robotic missions, human spaceflight and also technology demonstrations. It also is a big contributor to the International Space Station.
27 August 2013, 11:59 PM ET
The European Space Agency coordinates space activities among 20 member states.
26 August 2013, 06:43 PM ET
Some scientists think the sun is part of a binary system and that it has a companion star that affects life on Earth.
26 August 2013, 04:59 PM ET
The Canadian Space Agency is famous for its astronaut program and robotics technology.
25 August 2013, 05:28 AM ET
A brief biography of the naval aviator, test pilot, astronaut.
23 August 2013, 06:17 PM ET
Binary stars are two stars orbiting a common center of mass.
21 August 2013, 06:00 PM ET
A red giant star is a dying star in the last stages of stellar evolution. Our own sun will turn into a red giant star, expand and engulf the inner planets, possibly even Earth.
20 August 2013, 06:11 PM ET
NASA's Lunar Atmosphere and Dust Environment Explorer (LADEE) is set to launch to the moon in September 2013. Here is everything you need to know about it.
19 August 2013, 11:25 PM ET
Most of the stars in the universe are main sequence stars. The sun is a main sequence star.
15 August 2013, 06:33 PM ET
Elliptical galaxies are dim collections of older stars, so they don't shine as brightly as spiral galaxies.
15 August 2013, 12:01 AM ET
A spiral galaxy has a distinct winding shape. Most of the galaxies observed by astronomers are spiral galaxies.
02 August 2013, 02:02 PM ET
Triton has some peculiarities about its environment, including the fact that it orbits backward to Neptune's rotation and seems to have undergone a huge melt in the past.
02 August 2013, 02:00 PM ET
Scientists have found moons of Neptune as late as 2013, a quarter-century after Voyager 2 was the first and last spacecraft to swing through the system.
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