SUNSET: 
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.
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.
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.
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.
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.
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.
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.
Hubble Servicing Delayed
NASA's upcoming service call on the Hubble Space Telescope won't happen till late September or early October.
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!
The Sun Really Rocks!
Newly released video shows that the entire Sun shimmies and shakes in the aftermath of a big solar flare.
"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.
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.
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.
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.
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.
A Rich Protoplanetary Soup
Infrared observations reveal a star with a protoplanetary disk infused with helpful organic compounds.
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?
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.
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.
