Earth-like fog shrouds chilly lakes on the south pole of Saturn's largest moon, confirming that Titan has an active "methane cycle," astronomers say.

With cautious optimism, physicists say they may have finally "felt" the ghostly effects of mysterious dark matter deep in a Minnesota mine.

A newfound planet close enough for us to probe its atmosphere is almost the same size and composition as Earth—but is still "completely alien" to anything in our solar system, astronomers say.

The massive column of molten rock that feeds the park's volcano dives deeper and fills a magma chamber bigger than previous estimates, according to the most detailed model yet of the region's plumbing.

Aspiring space tourists will get a glimpse of their future ride late Monday, when Virgin Galactic takes the wraps off the first of its long-awaited SpaceShipTwo planes.

With its first data from a particle collision, the Large Hadron Collider has "taken off safely," one scientist says. But the trip isn't over yet—and higher-energy collisions could come before Christmas.

With its first data from a particle collision, the Large Hadron Collider has "taken off safely," one scientist says. But the trip isn't over yet—and higher-energy collisions could come before Christmas.