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Largest Optical Telescopes

Largest Optical Telescopes of Today & Tomorrow Name and location Primary-mirror aperture (meters) European Extremely Large Telescope (proposed) 42 Thirty Meter Telescope (proposed) 30 Giant Magellan Telescope (proposed) Cerro Las Campanas, Chile 24.5 Gran Telescopio Canarias (GTC) La Palma, Canary Islands 10.4 Keck Telescopes Mauna Kea, Hawaii 10.0 (×2) Southern…

Adaptive Optics

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The Challenge of Adaptive Optics

Adaptive-optics systems aim to improve the resolution of astronomical observations by compensating for the effects of air turbulence.

Keck Observatory

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Stars and Paradise

The twin 10-meter telescopes of Keck Observatory are among the highlights atop Mauna Kea, Hawaii. To the left is the Japanese Subaru Observatory.W. M. Keck ObservatoryWhen most people think of Hawaii, they ponder volcanoes, luaus, hula dancers, and pineapples. But Hawaii also sports one of Earth's best vacation spots for…

2008 Eclipse

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The 2008 Eclipse and the Saros Cycle

The August 1, 2008, total eclipse is similar to a couple of significant past eclipses. Here's why.

Sky & Telescope Magazine

Inside the November 2007 Issue

PURCHASE PRINT ISSUE | PURCHASE DIGITAL ISSUE | DOWNLOAD BACK ISSUES | SUBSCRIBE TABLE OF CONTENTS Spectrum No Laughing Matter By Richard Tresch Fienberg Skyscape Short-Lived Sunspot By Jerry Lodriguss Mission Update By Jonathan McDowell 50 & 25 Years Ago By Leif J. Robinson The Great Mars Chase of 1907 A century…

Sky & Telescope Magazine

Sky & Telescope December 2007

FEATURED ARTICLES Celebrating Cassini After 10 years in space and 3½ years since reaching Saturn, the Cassini orbiter continues to beam back wild and wonderful images.By J. Kelly Beatty The Star of Bethlehem Explained Astronomically speaking, the only explaination for the Star of Bethlehem is the most obvious one.By Aaron…

Sky & Telescope Magazine

Sky & Telescope January 2008

FEATURED ARTICLES Get Ready for Eclipse 2008 Want to see the only total solar eclipse in 2008? Your best bet for a view on solid ground involves a journey to meet the Moon's shadow as it crosses Siberia and northern China.By Fred Espenak and Jay Anderson Hot New Products for…

Sky & Telescope Magazine

Sky & Telescope February 2008

FEATURED ARTICLES February's Ideal Eclipse of the Moon A planet-studded total eclipse, and the last one until 2010, occurs high in a dark sky on February 20th.By Alan MacRobert The Astounding Comet Holmes An obscure comet beyond Mars exploded into view last October, giving skygazers an unexpected treat.By John E.…

Sky & Telescope Magazine

Sky & Telescope March 2008

FEATURED ARTICLES Where Did You Come From? You can thank your lucky stars for the calcium in your bones and the iron in your blood. But what about the iodine in your thyroid?By C. Renée James Gaia's Mission to the Milky Way In the next decade, a unique spacecraft will…

Sky & Telescope Magazine

Sky & Telescope April 2008

FEATURED ARTICLES Tomorrow's Monster Telescopes The next generation of enormous observatories is about to leave the drawing board and become reality.By Jonathan Lowe Savor Saturn in 2008 Your scope may show more on the ringed planet, now the "star" of the evening sky, than you realize.By Alan MacRobert Parched Planet…

Sky & Telescope Magazine

Inside the October 2007 Issue

PURCHASE PRINT ISSUE | PURCHASE DIGITAL ISSUE | DOWNLOAD BACK ISSUES | SUBSCRIBE TABLE OF CONTENTS Spectrum Back to the Future By Richard Tresch Fienberg Beyond the Printed Page: Your Thoughts About S&T's New Look Letters On the Web Skyscape The Hercules Cluster of Galaxies By Tony Hallas News Notes Mission Update…

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Sky & Telescope's Satellite Calculator

Launch Sky & Telescope's new Satellite Tracker.

Sky & Telescope Magazine

Inside the September 2007 Issue

PURCHASE PRINT ISSUE | PURCHASE DIGITAL ISSUE | DOWNLOAD BACK ISSUES | SUBSCRIBE TABLE OF CONTENTS Spectrum Full-Moon Fever By Richard Tresch Fienberg News Notes It's Official: Eris Outweighs Pluto, Comet McNaught's Iron Tail, and more ... Mission Update By Jonathan McDowell 75, 50 & 25 Years Ago By Leif J. Robinson…

Sky & Telescope Magazine

Inside the August 2007 Issue

PURCHASE PRINT ISSUE | PURCHASE DIGITAL ISSUE | DOWNLOAD BACK ISSUES | SUBSCRIBE TABLE OF CONTENTS Spectrum Denying Doomsday By Richard Tresch Fienberg Letters News Notes A Galaxy Core's Shadow Play, Volcanic Vents on Mars?, and more . . . Mission Update By Jonathan McDowell 50 & 25 Years Ago By Leif…

Sky & Telescope Magazine

Inside the July 2007 Issue

PURCHASE PRINT ISSUE | PURCHASE DIGITAL ISSUE | DOWNLOAD BACK ISSUES | SUBSCRIBE TABLE OF CONTENTS Spectrum Pluto on My Mind By Richard Tresch Fienberg Letters News Notes Catching Orion's Bullets, Ancient Volcanic Vents on Mars?, Earth's Temporary Moon, and more ... Mission Update By Jonathan McDowell 50 & 25 Years Ago…

Sky & Telescope Magazine

Inside the June 2007 Issue

PURCHASE PRINT ISSUE | PURCHASE DIGITAL ISSUE | DOWNLOAD BACK ISSUES | SUBSCRIBE TABLE OF CONTENTS Spectrum Our Golden Opportunity By Richard Tresch Fienberg Letters News Notes Postcards from Mars and Jupiter, The Big Bright Galaxy You've Never Seen, and more ... Beyond the Printed Page: Phobos Transits Mars Beyond the Printed…

Supernova Simulation

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Simulating a Type Ia Supernova

In the July 2007 issue of Sky & Telescope (page 32), science writer David S. Stevenson describes some of the recent progress made by astronomers in figuring out what causes Type Ia supernovae. Most supernova explosions signal the deaths of short-lived massive stars, but Type Ia blasts come from old…

Sky & Telescope Magazine

Inside the May 2007 Issue

PURCHASE PRINT ISSUE | PURCHASE DIGITAL ISSUE | DOWNLOAD BACK ISSUES | SUBSCRIBE TABLE OF CONTENTS Spectrum Around the World with S&T By Richard Tresch Fienberg Letters News Notes Dead Cataclysmics Unearthed, Seeking the Origins of Cosmic Rays, and more ... Mission Update By Jonathan McDowell 50 & 25 Years Ago By…

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Images from Apogee's Alta U9000 CCD Camera

While processing the images Dennis di Cicco recorded during his review of the Apogee Alta U9000 CCD camera, I was most impressed by the high sensitivity of the KAF-09000 chip. The images presented here are some of my favorites. Each of these photographs were recorded through a 15 nanometer passband…

Beyond the Printed Page

Transit of Luna

Click on image for a 2MB animation.NASAOn February 25th the Moon crossed the Sun in an unearthly annular eclipse — one that can never be seen from Earth. These ultraviolet images were taken by one of NASA’s two STEREO solar observatories, which were launched last October and are now watching…

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