Far from Earth, a small robotic explorer has just delivered a surprise that planetary scientists have never seen up close ...

Spectacular clouds swirl across the surface of Jupiter. These clouds contain water, just like Earth's, but are much denser on ...

Planets that once lived only in pulp novels and movie concept art are now turning up in real data. Astronomers are not just ...

Saturn encounter, and the Beehive Cluster, as NASA highlights easy-to-see celestial events lighting up winter night skies.