13 March 2013, 11:16 AM ET
Behind the scenes look at the Clark telescope, built by Percival Lowell to study Mars, that first discovered the expanding nature of the universe and mapped the Moon for the Apollo program. It is one of the largest refracting telescope ever built.
13 March 2013, 06:29 AM ET
See photos of the discovery and analysis of rock samples by NASA scientists using the Mars rover Curiosity.
13 March 2013, 06:00 AM ET
The Red Planet was habitable long, long ago, scientists say.
12 March 2013, 07:27 PM ET
NASA's Curiosity rover found oxygen, water, sulfate and other elements in a rock sample from Mars. [Full Story
12 March 2013, 07:13 PM ET
Answers to a few basic questions about the Curiosity rover's latest discovery.
12 March 2013, 01:40 PM ET
A look at the major steps forward in searching for life on Mars.
12 March 2013, 01:30 PM ET
Missions to Mars have searched, but haven't found definite proof of life past or present.
11 March 2013, 04:06 PM ET
A look at the nonprofit's plan to land four humans on Mars in 2023.
11 March 2013, 03:57 PM ET
Mars One has contracted with Paragon Space Development Corp. to do a conceptual design study.
11 March 2013, 01:42 PM ET
A new NASA challenge tasks students with protecting astronauts and hardware from deep-space radiation.
07 March 2013, 02:01 PM ET
NASA's Mars Reconnaissance Orbiter used radar to find the underground Martian channels.
06 March 2013, 08:30 PM ET
The solar outburst is complicating efforts to bring Curiosity back from a computer glitch.
05 March 2013, 04:56 PM ET
The Comet known as 2013 A1 (Siding Spring) flies about 31,000 miles away from the surface of the Red Planet on October 19th, 2014.
05 March 2013, 03:59 PM ET
Comet Siding Spring is expected to come within 30,000 miles of Mars in October next year.
05 March 2013, 07:00 AM ET
The 1-ton robot is out of safe mode and may be back in action as early as this weekend.
04 March 2013, 05:32 AM ET
The newfound comet C/2013 A1 (Siding Spring) has only a slim chance if hitting Mars.
02 March 2013, 07:00 AM ET
Exploring the final frontier has always been a tough proposition.
01 March 2013, 03:32 PM ET
Engineers are trying to get Curiosity operational again after switching the rover from its primary computer to a backup.
28 February 2013, 07:00 AM ET
The Inspiration Mars Foundation is hoping to recruit a married couple for its 2018 manned Mars flyby mission.
27 February 2013, 05:59 PM ET
In the last year, private companies have unveiled asteroid mining projects, space rock sentinels and more.
27 February 2013, 01:01 PM ET
How will a private Mars mission in 2018 work?
27 February 2013, 01:01 PM ET
A new nonprofit hopes to launch a man and a woman on a Mars flyby mission.
27 February 2013, 09:49 AM ET
Since the 1960s, humans have invaded our neighboring planet Mars with swarms of spacecraft. Only half of the attempts ever succeeded.
27 February 2013, 06:42 AM ET
Space tourist Dennis Tito will announce a Mars mission to launch in 2018.
25 February 2013, 03:10 PM ET
McKay helped train the Apollo moonwalkers and led a study that claimed a Mars meteorite may contain signs of past life.
25 February 2013, 06:30 AM ET
Parts of the Red Planet may be exposed to flowing water seasonally.
23 February 2013, 07:00 AM ET
The Red Planet's signature color is only skin deep.
22 February 2013, 01:35 PM ET
For the first time on Mars, a rover has collected a rock sample using a drill. Curiosity's drill captured about 1 table spoon of Martian rock.
21 February 2013, 02:01 PM ET
Fifth-graders to college students can work with NASA's Mars Odyssey satellite.
21 February 2013, 02:00 PM ET
Images of Mars captured by middle and high school students by the THEMIS instrument on board NASA's Mars Odyssey.
21 February 2013, 01:32 PM ET
Dennis Tito's nonprofit organization may want to launch astronauts toward the Red Planet in 2018.
20 February 2013, 05:11 PM ET
The rover drilled into rock on the Martian surface on February 8th and 20th, 2013. Samples were also transferred back to the rover for analysis. The drill was demonstrated by NASA using Curiosity's twin here on Earth.
20 February 2013, 04:20 PM ET
See photos of NASA's Mars rover Curiosity's first drilling success.
20 February 2013, 04:06 PM ET
NASA's Mars rover made a giant leap for space exploration when it drilled its first sample of Red Planet rock.
20 February 2013, 12:59 PM ET
The press conference starts at 3 p.m. EST and may discuss Curiosity's drilling work on Mars.
13 February 2013, 03:00 PM ET
The president's annual address rarely mentions NASA, spaceflight or exploration.