SUNSET: 
Ready for Rosat's Reentry?
Sometime within the next week, perhaps on Sunday, a defunct German astronomy satellite will fall from orbit and drop a 1½-ton cosmic cannonball — its telescope assembly — somewhere on Earth.
Tune in for S&T's 70th Birthday Bash
Join the editors of Sky & Telescope on Thursday, October 20th, as we celebrate the magazine's 70th anniversary at the Harvard-Smithsonian Center for Astrophysics.
The Great World Wide Star Count
Join thousands of other "citizen scientists" in raising dark-sky awareness around the globe.
Is Mercury Alive After All?
The Messenger spacecraft has discovered unusual hollow formations on Mercury's surface. No one knows what causes them, but volatile-spewing volcanoes are candidates.
ALMA Radio Array Gets to Work
High in the Chilean Andes, at the nosebleed altitude of 16,400 feet (5,000 m), the Atacama Large Millimeter/submillimeter Array has begun to probe the depths of the radio universe as never before.
Draconid Meteors Arrive As Forecast
Chalk up another win for the meteor-shower modelers. Europeans saw a display of up to a couple hundred Draconid meteors per hour on Saturday evening.
Comet Water for a Parched Earth
Recent observations of comet Hartley 2 shed light on one of the oldest mysteries: where did Earth's water come from?
Past Meets Future at AAVSO's Centennial
Variable-star observers gathered to celebrate astronomy's most successful citizen-science organization. But old ways are ending, and a very different next century lies ahead for the AAVSO.
A Mad Dash for the Draconids
If celestial prognosticators are right, the little-known Draconid meteor shower could deliver hundreds of "shootings stars" per hour during a brief window on Saturday, October 8th. But the outburst's timing favors Europe, not North America.
First Science Results from Dawn
Closer observations shed light on the history of Vesta's cratered surface, its mineral composition, and its inner iron core.
Video Interview with Alan MacRobert
Alan MacRobert discusses his career at Sky & Telescope and talks about what he loves at Sky.
Three Cosmologists Share Nobel Prize
The Royal Swedish Academy of Sciences has awarded the 2011 Nobel Prize in Physics to (left to right) Saul Perlmutter, Brian Schmidt, and Adam Riess, whose observations of distant supernovae led to the realization that the expansion of our universe is accelerating.
Mercury Shows Its True Colors
After six months of studying the innermost planet with NASA's Messenger spacecraft, planetary scientists are discovering unexpected surface compositions and are finally zeroing in on how the innermost planet came to be.
Tour October's Sky! | September 30th, 2011
This is a month of transition: Northern summer becomes autumn, Saturn sets just before Jupiter rises, and Venus is moving from the morning sky before dawn to the evening sky.
WISE's Survey of Near-Earth Asteroids
A heat-sensing NASA spacecraft finds that there aren't nearly as many large and midsize asteroids hovering near Earth as astronomers thought. Now we can all sleep a little easier.
Citizen Scientists Track Down New Planets
Using data gathered by the Kepler Space Telescope, a legion of amateur planet-hunting volunteers have perhaps uncovered the existence of two alien worlds.
Observe Mira, the Amazing Star
The extraordinary variable star Mira is expected to peak in early October, 2011.
Sky & Telescope November 2011
Sky & Telescope's November 2011 issue is now available to digital subscribers.
Planet Hunters are Losing Count
The latest 500 planet candidates from the Kepler mission are just part of the story. But Terra II remains elusive.
One Image, Five Moons
A quintet of Saturn's moons come together in the Cassini orbiter's field of view for a group portrait.
