Planets like Jupiter and Saturn may form much more easily than previously believed, hints a study of red giant stars.

See images of the new Phoenix Mars Lander and the evidence for water on the red planet that the mission is designed to pursue.

As NASA's new Phoenix lander prepares for liftoff, catch up on the recent announcements of compelling evidence that suggests Mars had a watery past.

See a roundup of the week's news and events: Bridge over Mississippi River collapses, new Veil Nebula images released, and more.

See a roundup of the week's news and events: England experiences worst flood in 60 years, Thirty Years' War skeletons unearthed, and more.

See a roundup of the week's news and events: Britain's adventurer swims at the North Pole, heat wave sweeps Europe, fishers hook an ancient fish, and more.

The surface of the icy moon Iapetus froze solid during its infancy, locking the moon into its unusual bulging shape, scientists say.

"Killer electrons," supercharged particles that pose a significant hazard to spacecraft and astronauts, are formed right in Earth's back yard, new research shows.

Can an engineer bring sexy back—to the future? One scientist might, if her new space suit design makes it off the launching pad.

A gas giant orbiting a distant star shows signatures of water vapor in its atmosphere, a find that some say is the first evidence of water on a so-called exoplanet.

Some comets streaking through the atmosphere may have a more uniform mixture of ingredients than scientists had previously believed.

Using a technique that measures how much gravity bends light, astronomers say they have spotted early stars in galaxies more than 13 billion light-years away.

The massive tempest is currently "starving" the solar-powered rovers, so NASA has put the robots on regular nap-time schedules to try and wait out the storm.

Scientists need to rethink what constitutes life in their search for ETs and seek out so-called "weird" life-forms that could thrive in extreme environments, a new report says.

Despite its bathtub-ready appearance, Hyperion—Saturn's largest irregularly shaped moon—is anything but spongy.