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Celestial News & Events

What is the Black-Drop Effect?

The famous (or infamous) black-drop effect earned its place in history long before astronomers knew what caused it.

Astronomy & Observing News

Where to See the Annular Solar Eclipse Online

If you're not in the path of this weekend's “ring of fire” eclipse, find out where you can view it online.

Venus transits the Sun

Celestial News & Events

Where to See the Transit of Venus Online

Find out where you can view June 5th or 6th's transit of Venus online.

Stellar Science

Superflares from Sun-like Stars

NASA's Kepler mission is finding solar-type stars that emit jaw-dropping explosions of high-energy particles and radiation. Now astronomers are looking into why some solar-type stars emit superflares — and why the Sun never will.

Stellar Science

IBEX's Slower Sun — and No Bow Shock

NASA's Interstellar Boundary Explorer has discovered that the Sun has no bow shock, overturning the basis for decades of scientific research.

Black Holes

X-ray Outburst in Spiral Galaxy M83

Astronomers have spotted an unusual "ultraluminous" burst of X-rays coming from the otherwise barren region between the grand spiral arms of Messier 83.

People, Places, and Events

S&T’s NEAF Round-Up

Sky & Telescope editors just returned from our annual pilgrimage to the Northeast Astronomy Forum, where we scoped out new products and talked with our readers.

Stellar Science

“Coronal Cells” in Sun’s Atmosphere

Astronomers have discovered an unexpected new feature on the Sun, leading to further insights about the solar magnetic field.

Celestial News & Events

Venus Befriends Crescent Moon

The crescent Moon lies close to crescent Venus just after twilight tonight, a great target for a good pair of binoculars.

Stellar Science

Watch April 16th's Solar Flare!

The Sun erupted yesterday in a magnificent display, and more might be on its way.

Earth at night, Astronomy Picture of the Day, Oct. 1, 2006

Astronomy & Observing News

International Dark Sky Week

Light pollution affects more than just astronomy. Learn what you can do to save energy and baby sea turtles — and keep our skies dark.

Illustration of baryon acoustic oscillations

Astronomy & Observing News

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?


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.

False-color image of rare rectangular galaxy

Astronomy & Observing News

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.

Astronomy & Observing News

The Ultimate Mobile Guide to Saturn

Our new SaturnMoons app guides you around the ringed planet as it brightens in the night sky in advance of an April 28th opposition. Learn about Saturn's bizarre satellite family, then find the moons in your own scope.

Stellar Science

New Fuel for Type Ia Supernova Debate

The origin of the stellar explosions known as Type Ia supernovae has been a topic of hot debate for decades. A new study adds fuel to the fire.

Celestial News & Events

May 20th's Solar Eclipse — S&T Reports

Two editors headed to California, and a third to New Mexico, for May 20th's solar eclipse. Read their reports, along with those from S&T readers and featured pictures from our online photo gallery. We want to hear from you too!


How Many Rogue Planets Are There in the Milky Way?

A new analysis suggests that "nomad" planets, ejected from their home stellar systems and now adrift in the icy dark of interstellar space., could outnumber stars by as many as 100,000 to 1.

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