NASA Photos Show New Signs Of A Lake On Mars
The water and sediment flow might have been massive enough to build a mountain, NASA researchers say.
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Oh, Snap! NASA Promises Best Photo Yet Of Faraway Pluto
A spacecraft on its way to Pluto has just woken up from hibernation. By next month, scientists expect to have the first good pictures of the dwarf planet. All of the others have been, well, crummy.
Orion Spacecraft Splashes Down After High-Orbit Test
The unmanned spaceship, which could one day take astronauts to the Red Planet, circled Earth twice in a test mission of its basic systems that lasted just under 4 1/2 hours.
NASA Scrubs Launch Of Orion Spacecraft
After several issues, including high winds, stuck engine valves and a boat downrange of the launch site, the space agency said it would cancel today's planned launch of the new vehicle.
NASA Prepares To Test New Spacecraft (That You've Likely Never Heard Of)
The new vehicle, named Orion, is designed to carry humans into deep space. But most Americans aren't aware it exists.
WATCH: How Carbon Dioxide Travels Around The Globe
A NASA computer model visualizes in detail where carbon dioxide is released, how it moves across the globe and how it's affected by the seasons.
'Freakish' Sunspot Wows Astronomers
AR 2192, the largest sunspot seen since the beginning of the current 11-year cycle that started in 2008, is producing strong solar flares.
Mars Probes Give Scientists Box Seats For Rare Comet Flyby
A "mountain-sized" comet known as Siding Spring will pass very close to the red planet, where orbiters from the U.S., Europe and India, hope to get close — but not too close — to the action.
Secret U.S. Space Plane To Land After 22 Months In Orbit
There are many theories about what exactly the unmanned X-37B is doing as it circles the Earth on long-duration missions.