SUNSET: 
Alma Observatory Inaugurated
The future is now — the world’s most powerful radio telescope array was inaugurated yesterday.
The Moon Salutes Jupiter
On the evening of Sunday, March 17th, stargazers all across the Americas will be able to watch the Moon pass spectacularly close to Jupiter, the third brightest object in the night sky after the Moon and Venus.
Habitable Oasis on Mars?
The results from the Curiosity rover's first rock-drilling are in: the rock formed in the presence of fairly neutral, not-too-salty water and has a chemical makeup that might have provided energy for microorganisms.
Too Much Ado About Daylight-Saving Time
Still controversial, the annual switch to daylight saving time is annoying to backyard astronomers — and probably doesn't save any energy after all.
Mysterious Crab Nebula Flare
Once thought to be a stable source in the sky, the Crab Nebula has erupted in a gamma-ray flare. One of about a half dozen detected since 2007, the flare is ongoing and perplexes astronomers, who still wonder how it's created.
Update on Russia's Mega-Meteor
The cosmic intruder that exploded so spectacularly over Chelyabinsk last month was a typical asteroidal fragment. Now researchers are piecing together the story of its arrival and aftermath.
Mars has Front-Row Seat for 2014 Comet
Comet Siding Spring (C/2013 A1) has a small chance of striking the Red Planet in October 2014. It'll likely miss — but come close enough to put on a spectacular show for spacecraft on or near the planet.
Earth Briefly Gains Third Radiation Belt
Last September, just days after launching twin spacecraft deep into Earth's magnetosphere, space physicists discovered a third region of trapped high-energy particles in the Van Allen radiation belts.
Mystery Structure Around Black Hole
An X-ray flare revealed a bizarre black hole binary system, where a mysterious, moving structure blocks its visible light.
Tour March's Sky! | March 1st, 2013
Spring arrives on March 20th, astronomically speaking, and for a few days beforehand you have a chance to see Comet Pan-STARRS low in the west soon after sunset. Meanwhile, Jupiter is still riding high in the evening, along with Orion, the Hunter, and Sirius, the "Dog Star."
Black Hole Caught Spinning?
X-ray observations of a distant supermassive black hole might end a decades-long debate over the nature of these X-ray signals. But not everyone’s convinced that the observations are what they appear to be.
Tiny Telescopes Launch
Successfully launched February 25th, a pair of diminutive telescopes inside basketball-size cubes will give scientists new views of the brightest stars in the galaxy.
Scorching Rain on the Sun
NASA's Solar Dynamic Observatory captures "coronal rain," a beautiful and mysterious phenomenon on the Sun.
The Moon Meets (and Hides) Spica
On Thursday, February 28th, late-evening skywatchers in the Americas can see a waning gibbous Moon nestled very close to Virgo's alpha star. Those in Central and South America might even see Spica wink out!
Comet PanSTARRS Still Punking Out
In March, Comet PanSTARRS will climb above the sunset horizon into twilight view. But it won't be as bright as we hoped — and maybe not even visible to the unaided eye.
Info on Russian Meteor Pours In
The fireball that exploded over Russia on February 15th left more than a million square feet of damaged windows, bringing home how fragile life on Earth can be. Here's what S&T's staff has managed to piece together about what happened.
Tiniest Exoplanet Around a Sunlike Star
The Kepler mission has discovered an exoplanet smaller than Mercury orbiting a Sun-like star.
"Black Rain" on Callisto and Ganymede
Those distant, dinky irregular moons of Jupiter are likely responsible for deep drifts of dark dirt on the two largest Galilean satellites.
Stellar Senior Citizen
Astronomers have confirmed that the star HD 140283 is nearly as old as the universe.
Baby Black Hole Discovered
Astronomers investigating a supernova remnant see nothing but swirls of gas. The lack of stellar remains means the explosion must have birthed a black hole only 1,000 years ago.
