A large comet swooped in close to Mars over the weekend. NASA's orbiters had to hide from the debris, but still captured some great shots.
A rare close flyby of a comet near Mars put NASA's orbiters in a potentially dangerous situation, but also allowed them to study the moving space object.
The closest look ever at a new comet will happen when the mountain-size comet Siding Spring buzzes past Mars this weekend.
The Air Force says that the almost one-of-a-kind spacecraft "conducted on-orbit experiments" in the the longest-ever mission for the X-37B program.
Cameras on Earth weren't the only ones keeping an eye on the "blood moon" eclipse last week. NASA's Messenger space probe also captured the event.
New discoveries about volcanic activity on the moon may "rewrite the textbooks," according to space researchers.
Even our sun isn't immune from cosplay fever. A recent NASA image captures a perfect storm of magnetic fields that give the sun the look of a carved Halloween pumpkin.
The discovery of a new unusually bright dead star leads astronomers to question assumptions about a type of cosmic radiation -- and pulsars themselves.
Astronomers have located a black hole that appears to be from a new class of cosmic champion eaters.
NASA is preparing the new Orion spacecraft for a first test flight. Your name can fly along with it -- eventually to the Red Planet.
An unusual total lunar eclipse happening early Wednesday morning US time will turn the moon a coppery red and lucky watchers may even see a simultaneous sunrise and moonset.
The Bigelow Expandable Activity Module is on track to launch in 2015, and will be attached to the International Space Station to test the technology.
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