61–80 of 109 results
Abell 2744 galaxy cluster


Hubble Spies Faint Galaxies, Bountiful in Early Universe

Hubble has spotted more than 100 small, faint galaxies in the young universe, common as dust bunnies but previously out of reach of even the best telescopes.

Astronomy Travel

The Incredible Skies of Namibia

Explore two unique astronomical sites that lie under the dark skies of Namibia - the HESS high-energy array and the Africa Millimeter Telescope.

KIDS Dark Matter Map


Not-So-Clumpy Dark Matter Poses Cosmological Challenge

Astronomers analyzing a new sky survey have found that the distribution of dark matter in the modern universe is smoother than predicted from observations of a far younger universe.

Path of the occultation by Pluto on June 29, 2015

Solar System

SOFIA Dashes into Pluto's Shadow

Despite an 11th-hour scramble due to an unexpected in predictions, NASA's flying observatory was in the right place at the right time on June 29th as distant Pluto briefly covered a 12th-magnitude star.

People, Places, and Events

A Whirlwind South Pole Tour

S&T contributing editor Govert Schilling tells the story of his recent expedition to the unique science laboratory located at the inhospitable South Pole.

Professional Telescopes

Radio Astronomy in the Aussie Outback

It's not easy to get to the Murchison Radio Observatory in Western Australia. Being in one of the most remote regions of the country means there's hardly any radio interference that might otherwise compromise the astronomical observations. It's one of the most radio-quiet zones on the planet.


Planet Hunters are Losing Count

The latest 500 planet candidates from the Kepler mission are just part of the story. But Terra II remains elusive.

People, Places, and Events

Remembering Tom Gehrels (1925-2011)

Dutch-born planetary scientist and asteroid hunter Tom Gehrels passed away on July 11th. Sky & Telescope contributing editor Govert Schilling shares his memories of a unique person.

MMT Observatory

Solar System

Praising Arizona — II

S&T contributing editor Govert Schilling visits observatories in southern Arizona.

Solar System

Praising Arizona — I

S&T contributing editor Govert Schilling visits observatories in southern Arizona


COROT Finds the Smallest Exoplanet Yet

Astronomers have found the smallest transiting exoplanet yet, with a silhouette only about 1.7 Earth diameters wide. It's also the fastest-orbiting planet known, with a "year" lasting 20 hours.


Standard-Candle Supernova Confusion

Type 1a supernovas are crucial for measuring how the expansion of the universe has been changing. But no one knows for sure exactly what they are.


Rain of Super-Particles

A 45-year mystery solved? Scientists using the new Pierre Auger Observatory say they've finally tracked down where ultra-high-energy cosmic rays — "tennis ball particles" — are coming from.

Big nothing in space


Cold Evidence for a Cosmic "Texture"?

A ripple in the cosmic background radiation hints at an irregularity in spacetime. . . maybe.

Astronomy and Society

The Source of the Dinosaurs' Asteroid

Did a colossal collision in the asteroid belt 160 million years ago doom the dinosaurs? A just-published analysis argues strongly for exactly that.

Milky Way

Mira's Marvelous Tail

Mira, the closest and brightest of the red long-period variable stars, has thrown off a gassy hood and a comet-like tail so big that if you could see them, they would overflow your telescope's field of view.

Pro-Am Collaboration

A Ringside View of Uranus

Astronomers have assembled an armada of telescopes to observe Uranus in a way that hasn't been possible since the 1960s.

Professional Telescopes

The New Largest Telescope in the World

With an aperture of 10.4 meters, Spain's new Gran Telescopio Canarias is about to assume the title.

Astronomy & Observing News

Overgrown Planet, or Dwarf in the Desert?

Astronomers have uncovered a fascinating heavy object orbiting close to its star. The problem is, they aren't sure what to call it.

Astronomy & Observing News

Goodbye, Pluto. Hello, "Dwarf Planets"!

It's official: our solar system has eight planets, and Pluto is not one of them according to the International Astronomical Union.