13 April 2015, 01:01 PM ET
Liquid water likely lurks just below the surface of Mars on cold winter nights, according to new research. Is it enough to support microscopic life-forms?
12 April 2015, 11:01 AM ET
About 90 employees of NASA's Jet Propulsion Laboratory in Pasadena, California, ran a marathon-length relay around the facility's grounds on Thursday (April 9) to celebrate the Opportunity rover's Mars marathon.
12 April 2015, 09:34 AM ET
From a cosmic garden to fishing for space junk, don't miss these amazing space images of the week for April 12, 2015.
09 April 2015, 06:04 PM ET
Martian astronauts will need to be able to withstand the reduced gravity and increased radiation in deep space. And they'll have to find a way to deal with the boredom, experts say.
09 April 2015, 02:39 PM ET
NASA's Mars-studying MAVEN spacecraft notched a spaceflight milestone this week — its 1,000th orbit of the Red Planet. MAVEN arrived at Mars in September 2014 and began its yearlong prime science mission on Nov. 16.
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).
06 April 2015, 02:30 PM ET
Crewmembers aboard the International Space Station have assisted in picking spots on Mars for investigation by the Opportunity robot now wheeling about on that distant world.
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.
02 April 2015, 05:50 PM ET
Skywatchers around the world can look forward to spotting bright planets throughout April; observers just need to know where to look.
02 April 2015, 04:11 PM ET
The Planetary Society — a nongovernmental space advocacy organization — has announced its support of a plan to send humans into orbit around Mars' moon Phobos by 2033 and to the surface of the Red Planet by 2039.
02 April 2015, 07:04 AM ET
The awards set up NASA partnerships with 10 aerospace companies and one public university to develop tech in three different areas: advanced electric propulsion, human habitation and small satellites.
02 April 2015, 07:00 AM ET
The rocks, which lie at a site dubbed Garden City near the base of the 3.4-mile-high (5.5 kilometers) Mount Sharp, harbor ridges up to 2.5 inches (6 centimeters) tall that are composed of bright and dark mineral veins.
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, 07:06 AM ET
Engineers subjected the saucer-shaped Low-Density Supersonic Decelerator (LDSD) test vehicle, which is part of a project designed to help get heavy payloads down safely on Mars, to a "spin table" test at NASA's Jet Propulsion Laboratory Tuesday.
01 April 2015, 07:00 AM ET
The scars inflicted during the Curiosity rover mission's 2012 landing faded steadily for about two years, but the pace slackened thereafter, and some appear even to be darkening again, researchers said.
31 March 2015, 05:04 PM ET
The Mars Science Laboratory and components of the delivery spacecraft whence it came have been spied by the Mars Reconnaissance Orbiter on several occasions since in August 2012.
30 March 2015, 04:20 PM ET
NASA's Opportunity Mars rover has suffered another bout of amnesia, less than a week after engineers installed a software upgrade designed to fix its memory problems. The March 25 event didn't result in the loss of any science data.
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.
27 March 2015, 05:00 PM ET
With spring underway, the evening sky is in transition. What new stars and constellations will adorn the night sky for the next few months?
27 March 2015, 08:01 AM ET
An astronaut "smart shirt" -- one that could someday beam biometric information back to ground controllers to keep an eye on the spacefarer's health – is now on a space mission of sorts.
27 March 2015, 08:00 AM ET
NASA's newest Mars probe recently made a risky dive into the Red Planet's upper atmosphere to learn more about how the planet's climate changed over time.
26 March 2015, 02:00 PM ET
The iron heart of Earth's moon has been measured more precisely than ever before. In a new study, scientists used X-rays to study the type of iron likely presence in our lunar companion's core.
26 March 2015, 07:00 AM ET
The National Space Biomedical Research Institute Industry Forum has funded three companies as part of its "Vision for Mars" challenge, which seeks to mitigate the visual problems astronauts experience during long-term spaceflight.
24 March 2015, 06:06 PM ET
Opportunity completed the distance covered in the traditional footrace.
24 March 2015, 06:01 PM ET
The golf-cart-size Opportunity rover has now traveled 26.219 miles (42.195 kilometers) — the distance of a marathon race — since touching down on the Red Planet in January 2004, NASA officials announced today (March 24).
24 March 2015, 07:13 AM ET
A software upgrade has restored the use of Opportunity's flash memory, just in time for the rover to complete its Mars marathon. Opportunity will reach the mileage milestone after just another 47 yards (43 meters) of driving.
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.
23 March 2015, 10:12 AM ET
NASA's Mojave Volatiles Prospector (MVP) is placing a suite of instruments to detect water on the Earthly desert surface. This testbed will fine tune designs for future probes to Mars, the Moon and other solar system bodies.
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.
20 March 2015, 12:13 PM ET
On Feb. 20, 2015, the planets Venus and Mars joined Earth's moon to create a dazzling sight in the night sky. See photos of the triple conjunction by Space.com readers in our gallery here.
19 March 2015, 06:36 PM ET
The delay was necessitated by a lack of investment funding, which has slowed work on a robotic precursor mission that Mars One had wanted to send toward the Red Planet in 2018, Mars One CEO Bas Lansdorp said in a new video that posted March 19.
19 March 2015, 12:00 PM ET
An unexpected leak of a chemical designed to tag complex organic molecules in samples collected by NASA’s Mars rover Curiosity appears to have serendipitously done its job.
19 March 2015, 07:00 AM ET
NASA's MAVEN spacecraft spotted ultraviolet "Christmas light" auroras dancing in the Red Planet's atmosphere for five days leading up to Dec. 25, 2014.