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Ulysses spacecraft

Solar System

Ulysses' Space Odyssey Ends on July 1st

The only space mission ever to study the Sun’s poles directly will turn off at month’s end after a long life of trial and triumph.

Space Missions

GLAST Heads Up, Up, and Away!

NASA's newest space observatory is safely in orbit and getting ready to probe the high-energy universe.

Space Missions

Moonlets Perturb Saturn’s Ring

New observations from Cassini show small satellites are responsible for Saturn's F ring looking a little frazzled.

Space Missions

NASA UV Satellite Powers Down

After five years in orbit, CHIPSat enters a hibernation that may — or may not — be permanent.

Space Missions

"Holy Cow!" — Phoenix Spots Ice

If the Phoenix lander hadn't been able to find ice on Mars within reach of its robotic arm, NASA scientists would have been majorly bummed. They needn't have worried.

Mars from Phoenix lander


Is Mars Too Salty for Life?

A just-published study, coincidentally appearing as Phoenix prepares to get the dirt on Martian habitability, argues that the Red Planet's soil is at least 10 to 100 times saltier than Earth's oceans.

Space Missions

GLAST Ready to Go

Next week, NASA will launch its latest space observatory to provide our best look at the most powerful beacons in the universe.

Space Missions

Phoenix Readies for Arctic Adventure

So far, so good. NASA's Phoenix spacecraft has reached the north-polar plains of Mars, and scientists on Earth are getting ready to put it to work.

Solar System

Phoenix's Amazing Photo Finish

Whether by precise planning, good luck, or both, a high-power camera aboard the Mars Reconnaissance Orbiter captured the Phoenix lander during its parachute descent with a menacing crater looming in the background.

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.

Space Missions

Matter of Scale

Some ways to get your head around cosmic orders of magnitude.

Space Missions

Find a Missing Mars Lander!

Ever since it crash-landed in 1999, NASA's Mars Polar Lander has been playing "hide and seek" with scientists trying to locate its remains. Now they want you to try.

Space Missions

Hubble Servicing Delayed

NASA's upcoming service call on the Hubble Space Telescope won't happen till late September or early October.

Space Missions

Happy Birthday, Hubble!

Eighteen years ago today, astronauts aboard the Space Shuttle Discovery deployed the Hubble Space Telescope. And what an 18 years it's been!

Distant Pioneer

Space Missions

"Pioneer Anomaly" Solved?

The first spacecraft to reach the outer solar system have been mysteriously slowing down for decades. Put aside the exotic explanations; it may be just a matter of heat.

Space Missions

The Sun Really Rocks!

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

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.

Space Missions

A Record-Breaking Gamma-Ray Burst

The visible-light glow of a gamma-ray burst briefly shone at magnitude 5.4, despite its distance of 7.5 billion light-years — more than halfway across the visible universe.