07 April 2015, 04:50 PM ET
Solid signs of alien life will be spotted within 10 years, and definitive evidence will roll in within 20 to 30 years, NASA chief scientist Ellen Stofan said Tuesday (April 7).
07 April 2015, 03:45 PM ET
A telescope will soon allow astronomers to probe the atmosphere of Earthlike exoplanets for signs of life. To prepare, astronomer Lisa Kaltenegger and her team are modeling the atmospheric fingerprints for hundreds of potential alien worlds.
07 April 2015, 08:01 AM ET
When it comes to the search for life beyond Earth, the mantra is always 'follow the water.' But could an environment without H2O give rise to life in a different form? Scientists now say it's theoretically possible.
07 April 2015, 07:01 AM ET
A new study sheds light on how exoplanets in tightly-packed solar systems interact with each other gravitationally by affecting one another's climates and their abilities to support alien life.
06 April 2015, 07:35 AM ET
A new exhibit at the American Museum of Natural History in New York highlights extreme examples of life on Earth, and what they may tell us about life elsewhere in the universe.
05 April 2015, 10:15 AM ET
What were our favorite stories of the week? This week had something for every kind of space fan. Find out our favorite stories of the past seven days below:
04 April 2015, 06:25 PM ET
From strange 'Hollows' on Mercury to eerie green space clouds, don't miss these amazing space images of the week for April 4, 2015.
03 April 2015, 07:00 AM ET
Scientists are still trying to understand what causes Mars' myriad dark streaks, and what these features might mean for the possible existence of Red Planet life.
01 April 2015, 08:00 AM ET
Ancient Mars may have featured oceans with huge, slow-moving waves. Studying the shorelines these waves may have carved could shed light on the ancient Martian climate, such as whether or not it had seas long enough for life to potentially develop.
01 April 2015, 12:00 AM ET
See amazing images of the night sky and cosmos in SPACE.com's gallery of cosmic images posted in March 2015.
31 March 2015, 03:30 PM ET
It is called NIROSETI for near-infrared optical SETI. This new instrument can record levels of light over time so that patterns can be analyzed and assessed for potential signs of other civilizations.
31 March 2015, 07:00 AM ET
Many astronomers had thought rocky, potentially habitable worlds could not take shape in the complex environment around binary stars. But mathematical simulations suggest otherwise, a new study reports.
31 March 2015, 07:00 AM ET
Earlier this month, researchers made two big announcements: Saturn's moon Enceladus likely harbors hot springs, and Jupiter's huge satellite Ganymede apparently possesses a subsurface ocean that may contain more water than all of Earth does.
30 March 2015, 06:40 AM ET
If an alien planet in a distant solar system were home to microscopic life-forms, how might scientists see them and even decipher their identity? A new catalog of Earth-based life forms may provide a first step.
29 March 2015, 09:51 AM ET
Two spaceflyers blasted off on the first-ever yearlong mission to the International Space Station and NASA announced its plan to haul a boulder from a near-Earth asteroid to lunar orbit. Here's a look at Space.com's top stories of the week.
28 March 2015, 01:34 PM ET
From the first (contraband) corned beef sandwich in space to astronomy's oldest known 'Nova,' don't miss these amazing space images of the week for March 29, 2015.
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.
24 March 2015, 04:28 PM ET
NASA's Kepler mission team will receive the Smithsonian National Air and Space Museum's 2015 Trophy for Current Achievement. Tom Krimigis of the Johns Hopkins University's Applied Physics Lab, will get the museum's Lifetime Achievement award.
23 March 2015, 03:01 PM ET
Nitrogen was available on ancient Mars in a form that microbes could have used to build key biomolecules, and atmospheric carbon monoxide has been a feasible energy source for life throughout the Red Planet's history, two new studies suggest.
21 March 2015, 07:32 PM ET
The semi-taboo Titus-Bode relation could provide useful hints about the periods of as-yet-undetected planets around other stars.
21 March 2015, 04:00 PM ET
From St. Patrick's day in space to a spectacular solar eclipse, don't miss these amazing space images of the week for March 21, 2015.
19 March 2015, 01:00 PM ET
For years, many astronomers thought planets around red dwarfs were probably uninhabitable. But recently, the thinking has begun to change.
14 March 2015, 12:32 PM ET
From a monster solar flare to a spectacular night launch, don't miss these amazing space images of the week for March 15, 2015.
13 March 2015, 12:30 PM ET
An Earth-size alien waterworld tilted on its side may still be able to support life, if the oceans aren't too shallow, a new study suggests. Oceans are the key to keeping the climate stable enough on highly oblique worlds.
12 March 2015, 01:50 PM ET
Ganymede, Jupiter's largest moon, has a vast underground ocean of salty water, NASA scientists announced Thursday (March 12). The ocean on Ganymede was discovered with the Hubble Space Telescope.
09 March 2015, 08:00 AM ET
The $600 million Kepler mission launched from Florida's Cape Canaveral Air Force Station on March 6, 2009. After a two-month commissioning phase, Kepler began searching for exoplanets — and began etching its name into the history books.
08 March 2015, 12:48 PM ET
A powerful camera spotted a comet and scientists captured images of a supernova four different times. Here are Space.com's pics for the top space stories of the week.
07 March 2015, 02:34 PM ET
From an amazing photo of Comet Lovejoy captured by a dark energy camera to Comet 67P/Churyumov-Gerasimenko, don't miss these amazing space images of the week for March 7, 2015.
06 March 2015, 04:01 PM ET
Researchers scanning the atmospheres of exoplanets for gases produced by living creatures should hunt for more than just oxygen, methane and other "biosignatures" that swirl about in Earth's air, MIT's Sara Seager says.
05 March 2015, 05:30 PM ET
See amazing images of the night sky and cosmos in SPACE.com's gallery of cosmic images posted in February 2015.
01 March 2015, 12:41 PM ET
Astronomers discovered the most gigantic black hole yet known and Leonard Nimoy — Mr. Spock from the beloved "Star Trek" series — passed away at the age of 83. Here are Space.com's pics for the top space stories of the week.
28 February 2015, 03:32 PM ET
From a record-setting parafoil flight to a newly-tested space plane, don't miss these amazing space images of the week for March 1, 2015.