Cassini has confirmed the discovery of a previously unseen moon tucked in a gap in Saturn's A ring. The moon,…
With the launch of NASA's Swift spacecraft, Gamma Ray Bursts - those "most powerful explosions in the Universe" - have…
Our Sun can flare up from time to time, but probably nothing like the superflares it created in its early…
NASA's Cassini spacecraft took this photograph of Saturn's chaotic, tumbling moon Hyperion. Only 266 km (165 miles) across, Hyperion one…
Greetings, fellow SkyWatchers! We'll begin the week with a challenging unaided eye observation and head out to deep space as…
The European Space Agency's Mars Express took this image of 140-km (87 mile) Crater Holden on the surface of Mars.…
Controllers with the European Space Agency have deployed the first of Mars Express' MARSIS radar booms. During the operation, however,…
Saturn's moon Phoebe might have arrived at the planet after a long journey from the outer Solar System, according to…
Scientists analyzing images taken by the Mars Global Surveyor think they might have located the Mars Polar Lander spacecraft, which…
The European Space Agency's Envisat satellite snapped this picture of a marine phytoplankton bloom forming off the coast of Spain,…