10 April 2014, 07:00 AM ET
The enormous collision occurred 3.26 billion years ago and involved an asteroid 23 to 36 miles across — four to six times wider than the dino-killing space rock. The impact created a crater about 300 miles wide, researchers said.
09 April 2014, 05:17 PM ET
This is not the first time that people have seen more in Curiosity's images than is actually there. In September 2012, for example, the rover photographed a landscape that appeared to contain a rodent crouching between two rocks.
08 April 2014, 05:41 PM ET
NASA’s Mars rover Curiosity has begun science operations in a new area of study nicknamed “the Kimberly” after the Western Australian region.
08 April 2014, 02:30 PM ET
Though UFO enthusiasts may beg to differ, mission team members say that a bright flash of light visible in two images taken by the Curiosity rover on April 2 and April 3 almost certainly has a perfectly ordinary explanation.
08 April 2014, 07:00 AM ET
Scientists have begun realizing that spaceflight can cause serious and perhaps permanent vision problems in astronauts. NASA is working hard to understand the issue, which could present a major hurdle to mounting manned missions to Mars.
08 April 2014, 07:00 AM ET
Mars and the sun are directly opposite each other in Earth's sky today, which is why the formation is known as an opposition of Mars. You can watch two live shows about the Mars opposition here on Space.com beginning at 7 p.m. EDT tonight.
07 April 2014, 05:27 PM ET
Planets abound in the night sky this month, which affords good views of Venus, Jupiter and Neptune. And on Tuesday (April 8), Mars will make its closest approach to Earth in more than six years.
07 April 2014, 03:14 PM ET
NASA should set up a clear set of ethical rules regarding the health of astronauts on long-duration spaceflights — such as a trip to Mars — in the near future, according to a panel of health and ethics experts.
06 April 2014, 08:36 AM ET
The 1-ton Curiosity rover trundled 98 feet (30 meters) on Wednesday (April 2), topping a small hill that affords a good view of the surrounding area, which the mission team has dubbed "the Kimberley," officials said.
04 April 2014, 08:09 PM ET
To survive on Mars, astronauts may need to rely on an usual diet.
04 April 2014, 04:15 PM ET
Mars will be exactly opposite the sun in the sky in a rare cosmic alignment set to take place Tuesday (April 8).
03 April 2014, 07:00 AM ET
Scientists and engineers at NASA's Ames Research Center in Moffett Field, Calif., are drawing up a low-cost mission concept that would send a robotic spacecraft to Phobos or Deimos, one of Mars' two tiny satellites.
01 April 2014, 02:00 PM ET
April features eclipses of the sun and moon, a meteor shower and good opportunities to see Vesta and Ceres, the two biggest bodies in the main asteroid belt between Mars and Jupiter.
01 April 2014, 10:18 AM ET
Calling all space cadets: Earthwatch wants volunteers to help search for life on Mars in what has to be the most entertaining April Fools' joke you'll see this year.
31 March 2014, 02:48 PM ET
Red Mars' close encounter with Earth, a 'red moon' total lunar eclipse (visible from North America) and the Lyrid meteor shower will highlight the month of April 2014. Also, the mornings and evenings will showcase Jupiter, Saturn and Venus.
31 March 2014, 09:50 AM ET
Mars and Earth will only be 92 million miles apart at closest encounter in April 2014, called ‘opposition’. Mars will appear red-gold, glowing brighter than first magnitude stars. Only Jupiter, the Moon and Venus before sunrise will be brighter.
28 March 2014, 03:18 PM ET
Twice in the past two weeks the Mars rover Opportunity has experienced "cleaning events" that have blown some of the rusty powder away, allowing more sunlight to fall on the solar arrays, giving the six-wheeled rover a seasonal power-up.
27 March 2014, 03:09 PM ET
A new Hubble image, captured on March 11, shows what appear to be two jets of dust coming off the nucleus of Comet Siding Spring, which on Oct. 19 will miss Mars by just 84,000 miles — about one-third the distance between Earth and the moon.
27 March 2014, 07:11 AM ET
NASA's plan to capture an asteroid and park it near the moon is only one step on the way to Mars, NASA chief Charles Bolden said Wednesday (March 26). The space agency is planning an ambitious mission to send a robotic spacecraft to an asteroid.
25 March 2014, 02:27 PM ET
Sandstone layers with varying resistance to erosion are evident in this space wallpaper recorded by the Mast Camera on NASA's Curiosity Mars rover on Feb. 25, 2014, about one-quarter mile (about 400 meters) from a planned waypoint called "the Kimberley."
25 March 2014, 07:04 AM ET
Curiosity is just 282 feet north of a site called "the Kimberley," where four different types of terrain intersect. The rover's handlers are keen to study the Kimberley rocks and may even break out Curiosity's sample-collecting drill at the site.
24 March 2014, 04:32 PM ET
Volunteers with no astronomy experience can pick out craters on the moon as accurately as a researcher with five to 50 years' experience, a new study reports. The finding could give a further boost to the use of citizen scientists in research projects.
20 March 2014, 02:41 PM ET
A NASA spacecraft has spotted a big Martian gully that formed in just the past three years or so. While the gully looks a lot like river channels here on Earth, it likely was carved out by carbon dioxide rather than by flowing water.
20 March 2014, 10:39 AM ET
NASA's most powerful eye in the sky above Mars has bounced back from a recent computer glitch and resumed full duties observing the Red Planet.
18 March 2014, 05:37 PM ET
If you have clear weather this evening, you may catch a view of a waning gibbous moon accompanied by a very bright and colorful planet (Mars) to its upper left and a bright blue star (Spica) to its upper right.
18 March 2014, 03:44 PM ET
This color picture of the Martian horizon was taken by Viking 1 on July 24, 1976.
11 March 2014, 04:01 PM ET
NASA's Mars Reconnaissance Orbiter switched over to safe mode after unexpectedly swapping from one main computer to another. The glitch has suspended science operations, but mission officials are confident the probe can return to service soon.
10 March 2014, 08:00 AM ET
Researchers are developing flat, blanket-size landers that could be delivered en masse to worlds such as Mars or Jupiter's moon Europa. The approach could enable NASA to mount missions to places previously deemed too risky to explore, researchers say.
07 March 2014, 03:40 PM ET
A new study indicates that the entry, descent and landing of SpaceX's unmanned Dragon capsule at Mars is viable. Moreover, the capsule's descent technique would help set the stage for future human missions to the Red Planet.
07 March 2014, 02:34 PM ET
A look at the "Red Dragon" mission concept, which would use SpaceX's Dragon capsule and Falcon Heavy rocket to bring Red Planet samples — perhaps gathered by NASA's 2020 Mars rover — to Earth.
07 March 2014, 06:47 AM ET
This series of Hubble Space Telescope photos captures a rare event in action, the breakup of asteroid P/2013 R3 as it happened in 2013 and 2014. See the amazing Hubble photos here.
07 March 2014, 06:30 AM ET
Astronomers have seen comets break apart as they near the sun, but they'd never witnessed anything similar in an asteroid in the main belt — until now. Hubble images show that the asteroid, known as P/2013 R3, has fragmented into 10 pieces.
06 March 2014, 02:02 PM ET
A huge meteorite impact on Mars was so powerful that it blasted a bunch of Red Planet rocks in Earth's direction five million years ago. The cosmic crash is the source of all "shergottite" Martian meteorites found on Earth, researchers say.
05 March 2014, 01:04 PM ET
NASA's Mars MAVEN mission (arriving 21 September 2014) will detect and measure how the solar wind interacts with the Red Planet’s atmosphere, giving clues to where its water went and why.
05 March 2014, 11:00 AM ET
NASA unveiled its 2015 budget request on Tuesday (March 4), a $17.5 billion spending plan that would maintain the space agency's major ongoing missions. See Space.com complete coverage of NASA's 2015 budget request here:
04 March 2014, 06:54 PM ET
If scientists do find life on Mars, it may be possible to beam Martian DNA back to Earth, according to a new idea growing in popularity. If Martian bugs can be found, the idea of "faxing" life from Mars is an enticing prospect.