04 December 2013, 10:59 AM ET
The U.S. Air Force’s secretive X-37B space plane program launches its third mission, OTV-3, on Dec. 11, 2012 using a United Launch Alliance Atlas 5 rocket. The mission marked the first reflight of an X-37B robotic space plane.
04 December 2013, 09:15 AM ET
This cluster of stars seen in this space wallpaper is known as Messier 15. It is located some 35,000 light-years away in the constellation of Pegasus (The Winged Horse).
04 December 2013, 09:01 AM ET
The world's fastest submarine in 1950, the Albacore, is tested for drag characteristics in a NACA wind tunnel.
04 December 2013, 06:00 AM ET
The unmanned X-37B launched into space atop an Atlas 5 rocket from Florida’s Cape Canaveral Air Force Station on Dec. 11, 2012. What payloads the space plane is toting and the overall mission goals on its confidential cruise are classified.
03 December 2013, 06:30 PM ET
SpaceX launched its first-ever commercial satellite bound for a geostationary orbit Tuesday (Dec. 3) in a landmark flight for the private spaceflight company.
03 December 2013, 06:22 PM ET
Gliese 581g is an extra-solar planet that was discovered in 2010, but quickly cast into doubt by other studies. The original discoverers then published a follow-up paper in 2012 defending their find.
03 December 2013, 06:00 PM ET
See photos from SpaceX's SES-8 satellite launch mission atop a an upgraded Falcon 9 rocket on Dec. 3, 2013. Liftoff occurred at 5:41 p.m. EST from Cape Canaveral Air Force Station in Florida.
03 December 2013, 05:47 PM ET
An upgraded Falcon 9 rocket lofted the SES-8 telecommunications satellite to a geosynchronous transfer orbit of 80,000km on Dec. 3rd, 2013.
03 December 2013, 04:01 PM ET
The secretive private spaceflight company Blue Origin has successfully test-fired a new engine for its rockets that could one day lift cargo and astronauts into orbit, NASA announced.
03 December 2013, 03:56 PM ET
Mustaches were everywhere. On the balloons, face-painted on children and of course, on the face of celebrity astronaut Chris Hadfield himself when he showed up at the book signing.
03 December 2013, 03:23 PM ET
A group of would-be astronauts are heading down to Florida this week to compete for the opportunity of a lifetime: a free trip to the edge of space and back again.
03 December 2013, 03:00 PM ET
Canadian astronaut Chris Hadfield visited his hometown Nov. 23, 2013 for a book signing event that attracted an estimated 1,000 people in Sarnia, Ont. – population 72,000.
03 December 2013, 02:59 PM ET
In one of the few behind-the-scenes looks at the private space company's assets, the hydrogen/oxygen fueled BE-3 rocket engine is test fired. Its being tested for use on the company's orbital launch vehicle.
03 December 2013, 02:54 PM ET
The five exoplanets are all scorching-hot, Jupiter-size worlds that are unlikely to host life as we know it. But finding water in their air still marks a step forward in the search for planets that may be capable of supporting alien life.
03 December 2013, 02:50 PM ET
See tantalizing spaceship photos from the secretive commercial space company Blue Origins.
03 December 2013, 01:54 PM ET
When a planet transits its star, the change in light tells its tale. Size, mass and atmospheric composition can be derived. Especially critical: Does it have oxygen, the marker of life?
03 December 2013, 12:57 PM ET
Want to know where to find Venus and Jupiter in the morning or the double star in Cassiopeia. Check out the Hubblesite's latest guide to the best places to look in the night sky. Telescopes are just one click away - Click the blue 'SHOP' link above.
03 December 2013, 12:18 PM ET
When it comes to space and energy, we need to think big. That's what one Japanese company is doing — and they're reaching for the moon, literally.
03 December 2013, 11:33 AM ET
Now two independent groups of researchers suggest quantum entanglement may indeed be linked to wormholes. If this connection is true, it could help bridge quantum mechanics with general relativity, potentially helping better understand both.
03 December 2013, 11:23 AM ET
The Large Magellanic Cloud is one of the closest galaxies to our own. Astronomers have used ESO’s Very Large Telescope to explore NGC 2035, one of its lesser known regions, in great detail as seen in this stunning space wallpaper.
03 December 2013, 10:22 AM ET
The private spaceflight company SpaceX will make its third attempt to launch a huge commercial communications satellite today (Dec. 3) in a landmark mission. The mission will launch at 5:41 p.m. EST (2241 GMT). Here's how to watch.
03 December 2013, 09:20 AM ET
NASA announced this week that is partnering with the billionaire-backed company Planetary Resources Inc., to launch asteroid-hunting competitions, seeking to crowdsource new ideas for software to find space rocks that could pose a threat to our planet.
03 December 2013, 07:27 AM ET
Over the past few years, astronomers have found super-Earth planets orbiting different types of stars. One scientist has reviewed the latest discoveries for insight into how these planets form and whether such worlds could be habitable.
02 December 2013, 06:58 PM ET
On winter evenings, a large cosmic figure, known as the Autumn Dipper, can be seen in the sky. This configuration looks like a much larger and brighter version of the Little Dipper.
02 December 2013, 06:31 PM ET
The celestial saga continues for Comet ISON, which crept close to the sun like the fabled Icarus, only to apparently survive the encounter in at least a tenuous form. But whether Comet ISON will again be visible to the naked eye is far from certain.
02 December 2013, 04:30 PM ET
See images of the space shuttle missions to repair the Hubble Space Telescope, STS-61, STS-82, STS-103, STS-109 and STS-125.
02 December 2013, 04:08 PM ET
India's first robotic Mars probe set sail for the Red Planet Saturday with a vital rocket burn to catapult the spacecraft out of the realm of Earth's gravity and into interplanetary space.
02 December 2013, 03:30 PM ET
China's first lunar rover is now bound for the moon, having launched Dec. 1 on a mission that — if successful — will establish China as the third nation to soft land a spacecraft on Earth's natural satellite.
02 December 2013, 02:59 PM ET
Now that autumn is fading into winter, the beautiful winter Milky Way is coming into view in the eastern sky.
02 December 2013, 02:27 PM ET
This month marks the 20th anniversary of STS-61, the space-shuttle mission that repaired the Hubble Space Telescope's faulty optics. Last week, MIT hosted a symposium to commemorate the mission and to celebrate Hubble's legacy.
02 December 2013, 01:53 PM ET
A black dwarf is all that is left after a white dwarf star burns off all of its heat, but retains its mass.
02 December 2013, 01:49 PM ET
Brown dwarfs never burn fusion at their core, so scientists sometimes refer to them as "failed stars."