Scientists say dark matter around many galaxy clusters is a flattened, cigar-like shape, rather than a rounded sphere.
Water ice discovered on the surface of an asteroid orbiting the sun between Jupiter and Mars lends credibility to the theory that asteroids, not comets, brought water to Earth.
For the first time, astronomers detected the fluorescent signature of an exoplanet's atmosphere. Fluorescence can give scientists clues about processes that might make a planet habitable for life.
A rare storm system over Titan's tropics help explain the region's unique liquid-carved landscape.
The object that hit Jupiter last weekend released thousands of times more energy than the massive Tunguska blast in Siberia in 1908, say astronomers.