Earth’s Traveling Companion

July 27, 2011 | Astronomers have identified a small body sharing Earth’s orbit in a gravitationally stable resonance that keeps it from hitting us or escaping. Finally, Earth has a Trojan asteroid to call its own. > read more

Amateur Discovers A Planetary Nebula

July 28, 2011 | Austrian amateur Matthias Kronberger has found a planetary nebula near the northern constellation of Cygnus, the Swan. His discovery might help scientists understand the role of stellar companions in the formation of these glowing gas clouds. > read more

From Stars to Stardust

July 29, 2011 | Astronomers have determined that a recent supernova in the Large Magellanic Cloud created a half-Sun’s worth of dust — hinting that such stellar explosions might be an unexpectedly rich source of dust throughout the universe. > read more

Kepler’s Dilemma: Not Enough Time

July 27, 2011 | NASA’s planet-hunter has already identified more than 1,200 exoplanet candidates. But project managers now quietly acknowledge that the spacecraft will have serious difficulty spotting habitable, Earth-size worlds by the mission’s end next year. > read more

A Promising White-Dwarf Binary

July 26, 2011 | A team of scientists has found two white dwarfs locked in a close mutual orbit, providing an excellent chance to test Einstein’s general theory of relativity. > read more

Sky & Telescope September 2011

July 22, 2011 | Sky & Telescope‘s September 2011 issue is now available to digital subscribers. > read more


S&T: Lauren Darby

Tour August’s Sky by Eye and Ear!

July 29, 2011 | This is your last chance to spot Saturn before it sinks into the evening twilight. But there are many other celestial attractions to look for on August evenings. > read more

Ceres and Vesta in 2011

May 20, 2011 | The two brightest asteroids are fairly close to each other in 2011. Click here for instructions and charts to find them. > read more

Interactive Sky Chart is Unavailable

June 3, 2011 | Our popular Interactive Sky Chart will be unavailable for an indeterminate period. > read more

This Week’s Sky at a Glance

Twilight view

This Week’s Sky at a Glance

July 29, 2011 | Saturn and Spica sink to the sunset. Jupiter blazes high before dawn. And the bright asteroid Vesta — accompanied by NASA’s DAWN spacecraft! — comes to opposition. > read more


Mario Motta

Al Takeda / ATMoB

Light Pollution’s Medical Effects

July 20, 2011 | Watch an video interview with noted physician and dark-sky activist Mario Motta. > read more

The Battle to Control Light Pollution

July 21, 2011 | Listen to a podcast interview with Bob Parks, exceutive director of the International Dark-Sky Association. > read more

Let the Star Parties Begin!

April 14, 2011 | Want to gaze at the Milky Way all night or peer into the eyepiece of a 12-foot-tall telescope? Then escape the city lights and head for the nearest “star party.” > read more

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