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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.
"Coaxing Sea-Monkeys to swim when and where you want them to is even more difficult than it sounds," says Caltech scientist studying the critters' impact on ocean currents.
A gorgeous pic snapped by Cassini shows the outer rings of Saturn in crisp detail, with ice moon Tethys bringing up the rear.
The discovery of a new unusually bright dead star leads astronomers to question assumptions about a type of cosmic radiation -- and pulsars themselves.
A rare picture snapped by Saturn probe Cassini shows three of the planet's moons -- all of which are very different from each other.
A "magic island" on Saturn's intriguing moon Titan has once again popped up on Cassini's radar, but it seems to have changed its look since the last time it was spotted.
After two years of exploration and driving, NASA's Curiosity rover has finally reached the base of Mount Sharp, a major goal of the mission.
A professor at UC Berkeley (in California's earthquake country) has created a prototype device that warns of pending quake-related rumbles and could be installed as easily as a home fire alarm.
Using an Android smartphone, a commercially available cell phone image sensor, and Legos, researchers take one giant leap in the 100-year-old world of the Petri dish.