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.
26 February 2015, 01:50 PM ET
An interview with Frank Drake, who conducted the first search for extraterrestrial intelligence (SETI) experiment in 1960 and came up with a famous equation that estimates the possible number of alien civilizations.
25 February 2015, 07:00 AM ET
Planets spinning on their sides were long thought to have climates too extreme for life as it is known on Earth, but now scientists find that these "rotisserie" worlds might be more hospitable.
24 February 2015, 07:00 AM ET
For more than 50 years, scientists have been scanning the heavens for signals that may have been generated by intelligent alien life. Some researchers are advocating that we beam out signals of our own designed to catch aliens' eyes as well.
21 February 2015, 12:42 PM ET
From mysterious plumes on Mars to a space station made of matchsticks, don't miss these amazing space images of the week for Feb. 22, 2015.
20 February 2015, 07:00 AM ET
NASA officials have asked scientists to consider ways that a Europa mission could search for evidence of alien life in the plumes of water vapor that apparently blast into space from Europa's south polar region.
17 February 2015, 07:23 AM ET
Small, cold stars known as red dwarfs are the most common type of star in the Universe, and the sheer number of planets that may exist around them potentially make them valuable places to hunt for signs of extraterrestrial life.
14 February 2015, 12:40 PM ET
From a colorful cosmic "flower" to a smiley face in space, don't miss these amazing space images of the week for Feb. 15, 2015.
11 February 2015, 07:00 AM ET
The search for life on Mars presents us with many challenges – not the least of which is microbial contamination. How do we ensure that microbes from Earth don't hitchhike all the way to the Red Planet and spread there?
11 February 2015, 07:00 AM ET
Scientists are discovering ways in which single cells might have evolved traits that entrenched them into group behavior, paving the way for multicellular life.
10 February 2015, 03:00 PM ET
Life on the moon would be very different for explorers than life on Earth. See how in this Space.com infographic.
09 February 2015, 08:00 AM ET
These shots of the Martian surface from orbit show our planetary neighbor as never before.
06 February 2015, 07:20 AM ET
The Moon has long been viewed as a crucial component in creating an environment suitable for the evolution of complex life on Earth, but a number of scientific results in recent years have shown that perhaps our planet doesn't need the Moon as much as we
06 February 2015, 07:00 AM ET
In 1938, Orson Welles narrated a radio broadcast of “War of the Worlds” as a series of simulated radio bulletins of what was happening in real time as Martians arrived on our home planet. The broadcast is widely remembered for creating public panic, altho
04 February 2015, 07:13 AM ET
New research finds methane in rock that had been buried perhaps 12 miles (19 kilometers) underground millions of years ago.
04 February 2015, 07:07 AM ET
Scientists hope to create artificial cells that closely mimic what biological ones do so that it would be easy to create laboratory conditions to test out how they evolve.
02 February 2015, 04:20 PM ET
The White House is requesting a $500 million boost for the NASA budget in 2016, potentially propelling the space agency on its way toward sending humans to Mars in the future, the agency's chief said Monday.
01 February 2015, 12:00 AM ET
See amazing images of the night sky and cosmos in Space.com's gallery of cosmic images posted in January 2015.
30 January 2015, 12:20 PM ET
Seven thousand year-old rock paintings in the Sahara desert have, somewhat serendipitously, helped uncover evidence of ancient lake beds.
30 January 2015, 12:00 PM ET
With 4km-long lasers, the Laser Interferometer Gravitational-wave
Observatories (LIGO) may detect cataclysmic events far from Earth. This film shows how scientists bridge the gap between the special language of astrophysics and bright young students.
30 January 2015, 07:30 AM ET
Frigid "mini-Neptunes" that take shape relatively far from red dwarf stars could be dragged inward over time, eventually losing most of their thick, gaseous envelopes and ending up in spots warm enough for life as we know it to survive.
30 January 2015, 07:20 AM ET
Scientists on the Curiosity team have brought into question a recent report about potential trace fossils in the Mars rover's images of the Gillespie rock outcrop.
29 January 2015, 04:43 PM ET
ETs may be tiny, but we'll find them.
27 January 2015, 04:40 PM ET
The newfound exoplanets circle a star that's 11.2 billion years old and are all Venus-size or smaller. They are, therefore, all rocky, though scientists know nothing else about their composition.