581–600 of 615 results


A Tatooine Family

Astronomers have discovered two exoplanets orbiting two stars, both answering and raising questions about how planets form.

Space Missions

NASA Lofts Radiation-Belt Space Probes

Two space probes launched toward the Van Allen radiation belts today. They’ll help scientists observe and predict the behavior of ultrafast, and potentially harmful, charged particles.


How NuSTAR Catches X-rays

NASA's NuSTAR mission will give sharper-than-ever views of the high-energy universe. But corralling X-rays is like herding cats. These wily photons have enough energy to penetrate through our skin and muscles as if they weren't even there, and bringing them to a focus is no easy task. Principal Investigator Fiona…


New Heavyweight Galaxy Cluster

Astronomers have discovered a supermassive galaxy cluster that both meets and challenges expectations for how clusters ought to behave.


Fly Through a 3D Map of the Universe

A mind-boggling 1.5 million galaxies trace out the filaments, clusters, and voids in Sloan Digital Sky Survey's new 3D map of the universe.

Space Missions

Watch Curiosity Descend onto Mars

See through Curiosity's eyes as it descends to the surface of the Red Planet.

Astronomy & Observing News

The Curious Avalanches of Iapetus

Saturn's two-faced moon hosts extraordinary avalanches that cascade much longer than they should. Figuring out what makes them flow might help scientists better understand landslides on Earth.


Galaxy Zoo's Odd Black Holes

Citizen scientists are helping astronomers understand how galaxies and their resident supermassive black holes grow.

Astronomy & Observing News

A Peek Inside Sky & Telescope September 2012

Sky & Telescope's September 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 September 1st.

Astronomy & Observing News

Ancient Spiral Galaxy Discovered

An ancient spiral galaxy offers another tantalizing clue to how nature might create these grand designs.

Astronomy & Observing News

Seeing "Dark" Galaxies

After years of failure, astronomers have finally succeeded in imaging primeval clouds of gas like those that existed before there were stars.

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.

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.

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.

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.