30 September 2013, 10:03 AM ET
Comet ISON could shine brightly in the night sky around the time of its close solar approach on Nov. 28. Here's the lowdown on ISON and its journey through the inner solar system, which scientists are already tracking with a variety of instruments.
27 September 2013, 12:47 PM ET
A toxic chemical in Martian dirt may obscure scientists' search for extraterrestrial life. Perchlorates on the Red Planet may cause reactions in Curiosity's soil samples that destroy organic compounds, researchers say.
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, 05:01 PM ET
Water on Mars has long been sought after by researchers.
26 September 2013, 02:01 PM ET
Future Mars explorers should be able to get all the water they need out of the red dirt beneath their boots, a new study suggests. NASA's Mars rover Curiosity has found that surface soil on the Red Planet contains about 2 percent water by weight.
24 September 2013, 06:02 PM ET
The 1-ton Curiosity rover paused to examine a few rocks late last week, making the first of five planned science stops en route to the 3.4-mile-high Mount Sharp. The break was fruitful, returning further signs of long-ago flowing water.
24 September 2013, 07:01 AM ET
Sick astronauts could conceivably have been infected on Mars, some parts of which may be capable of supporting life as we know it. So the world may be reluctant to welcome such travelers home, leery of unleashing an alien superplague on Earth.
19 September 2013, 03:28 PM ET
Small, serpentine robots could help Mars rovers collect soil samples from crevices beneath rocks and other hard-to-reach places, and they could pull their wheeled siblings to safety if the bigger vehicles get bogged down in soft sand.
19 September 2013, 02:01 PM ET
NASA's Mars rover Curiosity has revealed no trace of methane, a potential sign of primitive life, on the Martian surface, despite past observations of the gas by spacecraft orbiting the Red Planet and from Earth, researchers say.
19 September 2013, 07:00 AM ET
Comet ISON and Comet Siding Spring will buzz Mars over the course of the next year, prompting excitement and some concern that cometary particles could hit the spacecraft orbiting the Red Planet and exploring its surface.
18 September 2013, 04:51 PM ET
Water, water everywhere, and some of it fit to drink. That’s the picture of ancient Mars that has emerged during the past few months thanks to discoveries by NASA's Curiosity rover, which has been exploring the Red Planet since August 2012.
13 September 2013, 08:28 PM ET
What will life on Mars look like when the first settlers arrive?
12 September 2013, 01:52 PM ET
The process of selecting a site for NASA's next landing on Mars, planned for September 2016, has narrowed to four semifinalist sites located close together in the Elysium Planitia region of Mars, as seen in this space wallpaper.
11 September 2013, 03:42 PM ET
A group that's looking for the first Red Planet colonists received applications from more than 200,000 prospective astronauts vying for a spot on a one-way trip to Mars.
10 September 2013, 11:21 AM ET
Prominent patches of wind-blown dust, possibly mixed with volcanic ash, radiate from Becquerel crater and into a neighboring crater, as seen in this spectacular space wallpaper.
10 September 2013, 10:40 AM ET
The University College of London, the only UK host of a NASA Regional Planetary Image Facility, has recently released a stunning selection of the historic space pictures—many of them never published online before, others only ever in low resolution.
06 September 2013, 02:32 PM ET
NASA's Curiosity rover has captured two stunning videos of solar eclipses from the surface of Mars, including one that shows the Red Planet's skies darkening above the 1-ton robot. Curiosity recorded the eclipses on Aug. 19 and Aug. 20.
06 September 2013, 11:32 AM ET
The Mars Science Laboratory captured imagery of Mars' moon Phobos eclipsing the Sun on August 19th, 2013. It also captured the shadow cast by the eclipse.
05 September 2013, 08:37 PM ET
The Mars Science Laboratory had its sights set on the Sun when Phobos passed directly in front of it.
04 September 2013, 05:58 PM ET
Researchers are working on new rover software that say they could help prevent small, lightweight vehicles, such as the 1-ton Curiosity, from running into extraterrestrial sand traps like that one that doomed NASA's Mars rover Spirit.
04 September 2013, 05:38 PM ET
A colossal storm that raged on Saturn in 2010 and 2011 churned water ice up from deep within the ringed planet's thick atmosphere. NASA's Cassini spacecraft detected the ice crystals from orbit, marking the first observation of water on the planet.
04 September 2013, 04:14 PM ET
NASA is weighing candidate landing sites for its next mission to the surface of Mars, a three-legged InSight probe that will study the Red Planet's core in 2016. The $425 million mission will launch toward Mars in March 2016 and land near the planet's equ
04 September 2013, 03:55 PM ET
This space wallpaper is a comparison of how big the moons of Mars appear to be, as seen from the surface of Mars, in relation to the size that Earth's moon appears to be when seen from the surface of Earth.
03 September 2013, 06:42 AM ET
Tens of thousands of people are prepared to leave their families, jobs and lives behind for a one-way trip to Mars. But what sort of person would go?
01 September 2013, 01:00 PM ET
A key chemical ingredient for life may have been more abundant on early Mars than on early Earth, researchers say.
30 August 2013, 05:53 PM ET
Two Brown University scientists are a step closer to solving a four-decade old mystery about some unusual looking craters on Mars.
30 August 2013, 02:28 PM ET
Saturn, Venus, Mars and Jupiter will all be sharing the September nights' sky with the Moon, and toward the end of the month, comet ISON will line up with Mars.
30 August 2013, 11:14 AM ET
This space wallpaper shows part of a set of three images revealing views three seconds apart as the larger of Mars' two moons, Phobos, passed directly in front of the sun as seen by NASA's Mars rover Curiosity.
29 August 2013, 01:40 PM ET
NASA's Mars rover Curiosity has captured the sharpest-ever images of a solar eclipse as seen from the Red Planet. The 1-ton robot snapped pictures as Phobos, the larger of Mars' two tiny moons, blotted out much of the solar disk on Aug. 20.
29 August 2013, 08:20 AM ET
The 1-ton Curiosity rover used autonomous navigation for the first time on Tuesday. The robot will likely use this "autonav" capability more and more as it continues the long trek toward the base of Mars' huge Mount Sharp, NASA officials said.
28 August 2013, 06:05 PM ET
We may all be Martians. Evidence is building that Earth life originated on Mars and was brought to our planet aboard a meteorite, says biochemist Steven Benner of The Westheimer Institute for Science and Technology in Florida.
28 August 2013, 07:00 AM ET
A private Mars colonization effort has fallen short of its expected number of astronaut applications but still aims to put boots on the Red Planet in 2023. With a few days left in the application process, Mars One has received about 165,000 submissions.
28 August 2013, 06:32 AM ET
NASA's Maven mission will study the Martian upper atmosphere.
27 August 2013, 12:01 PM ET
Scientists are hoping to induce an unconscious state in astronauts so that they can be stored in cold capsules for long space flights. Here's how astronaut hibernation and suspended animation might one day work.
26 August 2013, 06:36 AM ET
By the time humanity is ready to put boots on Mars, the long cruise to the Red Planet may be as easy as a dream. NASA-funded scientists are investigating ways to induce hibernation in astronauts, which could make the Mars trip cheaper and more efficient.
23 August 2013, 10:27 AM ET
The deadline approaches for applications to join a one-way mission to Mars. Though the prospect is off-putting to many, it's also the dream of a lifetime to some.