521–540 of 544 results

Astronomy & Observing News

Impossibly Aligned Galaxies

Astronomers have found an alignment of galaxies along our line of sight that’s so rare, it ought to be impossible. Is it just luck — or does it tell us something more?

Astronomy & Observing News

How to Grow a Supermassive Black Hole

A new study says most black holes may grow by snacking instead of collision-induced feeding frenzies.



A Windy Early Universe

Winds in the early universe could make radio observations of the first stars and galaxies a little easier, says a new study published in Nature.

Astronomy & Observing News

X-ray Telescope Launches Successfully

NuSTAR, the first telescope to focus high-energy X-rays, launched today after 20 years of planning.

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

Exotic Objects Test Einstein’s Theory

Pulsars, supermassive black holes, and white dwarfs are all tools in astronomers' arsenals as they continue to push Einstein's theory of general relativity to its limits.

Astronomy & Observing News

Afghans Reach for the Stars

Reach for the Stars aims to bring astronomy back into Afghanistan’s elementary school curriculum in a way that resonates with the region’s culture and history.

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.

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.

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.

Solar System

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.

Solar System

“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.

Solar System

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.