1021–1040 of 1,114 results

Solar System

Phoenix: Redemption at Mars

NASA's Phoenix spacecraft has dropped gently onto the north-polar plain of Mars — easing painful memories of a similar craft lost 8 years ago and rewarding its anxious handlers with stunning views of the surrounding landscape.

Spirit's tracks uncover silica deposits that hint at past hydrothermal activity.

Space Missions

Mars Rover Unearths Ancient Hot Springs

The Mars rover Spirit uncovers evidence for hydrothermal activity on the Red Planet and a possible cache for microbial fossils.

Solar System

The Sun Really Rocks!

Newly released video shows that the entire Sun shimmies and shakes in the aftermath of a big solar flare.

Astronomy and Society

Apophis ad Absurdum

Was it a simple misunderstanding, sensationalist reporting, or an outright hoax? Whatever the answer, a recent story about a German student embarrassing NASA's asteroid experts shows how little mass-media reporters know about basic science — and how unlikely they are to check the facts.

Space Missions

Phobos Gets a Close-up

The small army of spacecraft now operating on and around Mars don't spend all their time watching the Red Planet. Check out this just-released view of one of Mars's moons.

Space Missions

What's Inside Enceladus?

In a daring dash over the south pole of Enceladus, the Cassini orbiter found organic molecules gushing from icy fractures on the Saturnian moon's surface — and hints that a reservoir of liquid water might exist deeper down.

Solar System

Titan's Free-Floating Crust

Saturn's giant moon isn't spinning the way a well-behaved satellite should — and some scientists argue that this deviant behavior is due to a global ocean hidden beneath its icy crust.

Solar System

Comet Hale-Bopp Still Lives

It's nearly as far away as Neptune, but the frozen gas in the Great Comet of 1997 is still melting.

Solar System

Cassini Gets a Face Full of Water

Who would have guessed that a decade after Cassini headed to Saturn, mission scientists would be flying it through an ice volcano's plume?

Solar System

What Happened to Mars?

Something happened to the Red Planet early in its history that left roughly half of it heavily cratered and the other half smooth and flat. Was this global facelift the work of a giant impact?

Astronaut collecting lunar soil

Solar System

A Whiff of Water From the Moon

After studying the samples returned by Apollo astronauts, geochemists concluded that Moon is probably the driest place in the solar system. But a new study has turned up a tiny trace of water in some green-colored volcanic beads collected near Mare Imbrium.

Space Missions

Genesis Finding: Earth Has a Problem

Even as the Genesis spacecraft lay in a crumpled heap on the ground after its reentry chute malfunctioned in September 2004, its scientists remained confident that they would salvage the mission and answer fundamental questions about how the solar system formed. Now they have — and the results have already sent cosmochemists back to the drawing board.

Solar System

Getting To Know Mercury

Planetary scientists have gathered in Houston, Texas, to get the latest news on what NASA's Messenger spacecraft learned when it zipped past the innermost planet two months ago.

Space Missions

Ring Around a Saturn Moon?

During a close flyby of Saturn's largest icy moon in late 2005, several instruments aboard Cassini sensed (but didn't actually "see") what appears to be a trio of thin rings and a dust disk surrounding Rhea.

Solar System

Four Martian Landslides Caught in the Act

A scarp along the edge of the Martian north polar cap is more active than anyone expected.

Solar System

Of Planets and Palace Elephants

A fourth-grader from Montana bested 800 other contestants to find a new way to remember all 11 major and dwarf planets.

Triple asteroid

Solar System

A Triple Asteroid Threat

After taking aim at a passing asteroid with the Arecibo telescope's powerful radar, astronomers discovered that it has two satellites.

Solar System

Mercury's "Better Half"

When it swept by the innermost planet on January 14th, NASA's Messenger spacecraft showed us a side of Mercury never before seen. After two weeks of intensive study, mission scientists have shared some of the flyby's intriguing results — including views of a "spidery" crater that has them stumped.

Stardust encounters Comet Wild 2

Space Missions

A Stardust-Free Comet

When NASA sent a spacecraft to grab samples of a comet and return them to Earth, scientists had high hopes that they'd finally be able to decipher how the solar system formed. Boy, were they wrong!


Mercury, Messenger, and Observers

As the first images are released from Messenger's flyby of the innermost planet, previous ground-based observations are proving to be surprisingly accurate.