Sky & Telescope September 2009

FEATURED ARTICLES

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Smashing the Distance Record
An exploding star establishes a new benchmark for most-distant known object in the universe.
By Edo Berger

Ice Age Impact
Scientists are debating whether a comet triggered the extinction of the large North American mammals.
By Ivan Semeniuk

The Cosmologist Left Behind
Edwin Hubble usually gets the credit, but Vesto Slipher saw the first signs that the universe was expanding.
By Marcia Bartusiak

BEYOND THE PRINTED PAGE

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Jupiter Without Moons
On the night of Sept. 2-3, all of Jupiter's moons are hiding either in front of the planet, behind it, or in its shadow. The sequence of events leading up to and away from this rare event is fascinating to watch.
By Tony Flanders

ALSO IN THIS ISSUE

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Deep-Sky Wonders
The globular clusters near the galactic core are amazingly diverse.
By Sue French

The AT106 Refractor
A 4.2-inch triplet APO for just $2,100.
By Alan Dyer

Table of Contents
See what else September's issue has to offer.