30 September 2013, 09:07 PM ET
Weightlessness, or the absence of gravity, has several short-term and long-term effects on astronauts.
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.
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, 09:29 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.
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.
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.
01 August 2013, 07:12 PM ET
Solar wind is a constant stream of plasma and particles emanating from the sun.
01 August 2013, 01:46 AM ET
Uranus has 27 known moons discovered through telescopes as well as the Voyager 2 mission to the planet in 1986.
31 July 2013, 01:26 AM ET
Neutron stars are city-size objects that pack quite a punch.
24 July 2013, 11:39 PM ET
The Lunar Reconnaissance Orbiter has uncovered extensive evidence of water on the moon.
23 July 2013, 04:59 PM ET
SDO provides insights on the structure of the sun's magnetic field, as well as how energy is transferred from the sun into space.
22 July 2013, 08:15 PM ET
Pollux, one of the main stars in Gemini, is bright and easy to find in the night sky. More recently, scientists found a planet orbiting the star.
20 July 2013, 04:24 AM ET
Spica is a bright binary star system in the Virgo constellation.