191 results
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.

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Sky & Telescope's Satellite Calculator

Launch Sky & Telescope's new Satellite Tracker.

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…

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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…

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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…

Penumbral shading

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Using Digital Imagery to Detect Earth's Penumbra

With a little help, you can see the first hint of the Earth's shadow — the penumbra — on the Moon's surface. Here's what you need to know.

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A Killer Blast?

Click on image for a 1MB animated GIF.Brian Fields, Themis Athanassiadou, Scott Johnson, and NASA.A supernova popping off near Earth could spell big trouble for our biosphere. University of Illinois astronomer Brian Fields and two colleagues used a computer to simulate what would happen if a star 30 light-years away…

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The Hyades Movie

Click above to watch the stars of the Hyades Cluster separate from the unrelated stars in Taurus.Anthony Brown In 1997 scientists associated with the Hipparcos satellite published a 3-D map of stars in the Hyades cluster. It was the first time that the structure of a star cluster had ever…

Spiral Metamorphosis

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Galaxies in Collision

Animations of the Milky Way colliding with the Andromeda Galaxy

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