SUNSET: 
Dark Energy BOSSes Around the Universe
Astronomers are honing in on the nature of dark energy, a mysterious, repulsive energy that pervades all of space. Among the questions they're trying to answer: does dark energy exist?
Comet Pan-STARRS: Still on Track
The inbound comet C/2011 L4, discovered last year, has been brightening steadily the past few months. It could still fizzle — or it could become a pretty bauble in post-sunset skies next March.
Far-out Black Hole Hints
“Star cities” orbiting galaxies may reveal the mass of the gargantuan black hole hidden deep in the galaxy’s heart. The new relation could be more evidence for a large-scale black hole-galaxy link — or, it could mean one of the latest revolutions in astrophysics isn’t the full story.
Honoring Titanic's 100th Anniversary
In honor of Titanic's 100th anniversary, read S&T's article from the April 2012 issue about the moon's role in sinking the unsinkable ship.
New ALMA Images Stoke Exoplanet Flame
Astronomers have released the first new science results from the Atacama Large Millimeter/submillimeter Array (ALMA), a still-under-construction network of 66 antennas in northern Chile. The new observations suggest the contentious Fomalhaut star system may have two small planets shepherding its gigantic ring.
Sky & Telescope's New Moon Globe
The year-long effort was time consuming and tedious, but S&T's staff is proud to unveil the first wholly new globe of the lunar surface in more than four decades.
Kepler Mission Gets Four More Years
NASA's incredibly successful planet-hunter has had its mission extended to 2016 — giving it extra time to find Earthlike worlds in Earthlike orbits.
Outer-Planet Moons Found — and Lost
A decade ago, astronomers used big scopes and deep exposures to find dozens of new moonlets around Jupiter and Saturn. But due to orbital uncertainties, 17 of them appear to be lost.
Venus Passes the Pleiades
Venus is passing through the Pleiades in a breathtaking spectacle that reaches its peak on April 3rd. This unique pairing is part of a series of Venus events in 2012, culminating in the June transit of the Sun.
The World Celebrates Astronomy
People are coming together this April for Global Astronomy Month 2012, a planetwide celebration of astronomy designed to bring people together through star parties, music and artistic performances, online observing events, and much more.
Giant Telescope Starts with a Bang
Crews have begun to remove 3 million cubic feet of rock from a mountaintop in the Chilean Andes to make room for what will be the world’s largest telescope.
Vesta: A Study in Black and White
NASA's Dawn spacecraft is scrutinizing the second-largest asteroid from close range. Yet some aspects of Vesta's surface — especially splashes of very bright and very dark material — are puzzling.
Hubble Images Stir Up Dark Matter Debate
Dark matter in the "Train Wreck" galaxy cluster (Abell 520) appears to behave in unusual ways. Now, new Hubble images are heating up the debate.
Hubble's Hidden Treasures Competition
Try your hand at creating a beautiful Hubble image and you might win an Apple iPod Touch or iPad.
An Emerald-Cut Diamond in the Rough
Astronomers have discovered a rare, rectangular galaxy 70 million light-years away. The dwarf galaxy's unique history presents a challenge for current theories of galaxy evolution.
Did the Moon Come From Earth?
New findings show that the Moon might have incorporated more of Earth when it formed than previously thought — a problem for the widely accepted "big splat" hypothesis.
Exciting Event on Mars!
Observers are reporting an unusual event on the Red Planet, well placed for western U.S. residents this evening.
Sky & Telescope May 2012
Sky & Telescope's May 2012 issue is now available to digital subscribers. Some print subscribers may have already received it, and it's officially on sale at newsstands starting April 3rd.
Supernova in M95
Professional and amateur astronomers recently spotted a new supernova in the spiral galaxy M95. But it took a few days to figure out what it actually was.
How Big is the Sun, Really?
By carefully recording the track of Mercury when it crossed the solar disk in 2003 and 2006, observers have measured the Sun's diameter more accurately than ever before.
