SUNSET: 
Sidewalk Astronomy Made Easy
Saturday, April 12th, was International Sidewalk Astronomy Night — when hundreds of amateur astronomers worldwide showed the public the beauty of the night sky.
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.
Tour April's Sky — By Ear and Eye!
What better way to enjoy April's evening sky sights than to let Sky & Telescope take you on a guided tour?
YourAudio Sky Tour: February 2008
Use this easy-to-follow guide to enjoy what's up in the February sky: Venus and Jupiter dancing in the dawn, Mars riding high among winter's evening stars, and a total lunar eclipse. Host: S&T's Kelly Beatty. (5MB MP3 download: running time: 5m21s)
Lights Out, Everyone!
It's National Dark-Sky Week, a time to take stock of how badly your nighttime environment has been overrun with poor-quality lighting — and a time to do something about it!
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.
Glimpse the Moon's Far Side
You can see 9% more Moon than just what's on the near side — thanks to lunar libration.
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.
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?
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.
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.
Ulysses Says Goodbye
After spending more than 17 years in space, a durable solar sentinel has lost its radio voice and its fuel lines will soon freeze solid.
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.
See the Doomed Spy Satellite!
Until it reenters the atmosphere — whole or in pieces — in the days ahead, you can see the decaying satellite USA 193 with your own eyes. Here's how to find it.
A "Prime-Time" Lunar Eclipse
The entire Moon will dive through Earth's shadow on the night of February 20th, for the last time until December 2010.
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.
Extreme Eclipse-Chasing
To enjoy the annular eclipse of the Sun on February 7, 2008, you either had to be an Antarctic penguin or a very dedicated and well-prepared traveler.
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.
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!
