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Description Astronomy - November 2013 (Special issue on Comet ISON) English | PDF | 80 pages | 18.4 mb FEATURES 24 COVER STORY - The science of comets Scientists have sent 12 missions to explore comets. Here’s what they’ve learned about these relics from the early solar system. MATTHEW KNIGHT 30 Comets: From superstition to science For thousands of years, scientists thought comets lived within Earth’s atmosphere, and nearly everyone believed these celestial visitors delivered death and destruction with their tails. GARY KRONK 36 The Sky this Month ISON at its brightest. MARTIN RATCLIFFE AND ALISTER LING 38 StarDome and Path of the Planets RICHARD TALCOTT; ILLUSTRATIONS BY ROEN KELLY 44 Illustrated: Anatomy of a comet Slip into a coma, sweep up a dust tail, and brace yourself against the solar wind. SARAH SCOLES; ILLUSTRATIONS BY ROEN KELLY 46 20 bright comets of the past 50 years Each of these cosmic visitors of the past half-century told a unique story and captured the attentions of observers and imagers. KARRI FERRON 52 Ask Astro - Predicting a comet’s path. 54 Comet ISON blazes into glory This frozen ball of gas and dust puts on a show in the predawn sky. RICHARD TALCOTT 60 Totality crosses Africa An eclipse shadow, exotic locations, and safaris will lure travelers to this event November 3. JOEL K. HARRIS 64 A field trip to the stratosphere Associate Editor SARAH SCOLES takes a ride with SOFIA. ON THE COVER A bluish tail of ionized gas and a yellow-white dust tail highlighted Comet Hale-Bopp in 1997. Observers hope Comet ISON puts on a similarly dazzling show this month. COLUMNS Strange Universe BOB BERMAN 10 Observing Basics GLENN CHAPLE14 Secret Sky STEPHEN JAMES O’MEARA18 QUANTUM GRAVITY Snapshot 9 Breakthrough 11 Astro News 12 IN EVERY ISSUE From the Editor 6 Letters 10, 14 Web Talk 22 New Products 67 Advertiser Index 71 Reader Gallery 72 Final Frontier 74 Related Torrents
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