SECRETS EXOPLANETS REVEAL White Dwarf Stars Shed New Light on Possible Life-Bearing Planets P
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No homework. Just a world of knowledge THEGREATCOURSES.CO/6ASTR available anytime, anywhere. Download or stream to your laptop or PC, or use our free apps for iPad, iPhone, Android, Kindle Fire, or 1-800-832-2412 Roku. Over 600 courses available at www.TheGreatCourses.com. Online Content Code: ASY1806 Enter this code at: www.astronomy.com/code JUNE 2018 to gain access to web-exclusive content VOL. 46, NO. 6 MARK GARLICK MARK ON THE COVER Astronomers are finding watery worlds orbiting stars around us — and the way some of those worlds get their water is surprising. 28 COLUMNS Strange Universe 14 CONTENTS BOB BERMAN FEATURES Observing Basics 16 GLENN CHAPLE 22 COVER STORY 38 58 For Your Consideration 18 Water worlds in the StarDome and Three nights at JEFF HESTER Milky Way Path of the Planets Pic du Midi How do planets get their water? RICHARD TALCOTT; Perched more than 9,400 feet Secret Sky 20 STEPHEN JAMES O’MEARA Scientists are looking for ILLUSTRATIONS BY ROEN KELLY above sea level, this French evidence in the light from white observatory ofers some of Binocular Universe 68 dwarfs. NOLA TAYLOR REDD 44 the inest viewing on Earth. PHIL HARRINGTON Astronomy Backstage DAMIAN PEACH 28 Pass: Chicago QUANTUM GRAVITY Exploring Jupiter’s his behind-the-scenes tour of 64 Trojan asteroids cool astro stuf in the Windy City Astronomy tests Snapshot 11 Astronomers have studied the includes Adler Planetarium’s QHYCCD’s new Remembering giant planet’s captured asteroids priceless artifacts, incredible astrocamera Stephen Hawking 12 only from afar. But that’s about meteorites in the Field Museum, he 128C ofers full-color Astro News 15 to change. JOEL DAVIS neutrino detectors at Fermilab, imaging, low noise, and ease and the rich history of Yerkes of use. TEXT AND IMAGES BY 36 Observatory. DAVID J. EICHER TONY HALLAS IN EVERY ISSUE Sky This Month From the Editor 6 Saturn takes center stage. 52 70 Astro Letters 8 MARTIN RATCLIFFE AND Discover great galaxies in Ask Astro ALISTER LING Coma Berenices he tides on Titan. New Products 66 Spirals, ellipticals, and interacting Advertiser Index 67 galaxies make a rich habitat for springtime galaxy hunters. Reader Gallery 72 STEPHEN JAMES O’MEARA Breakthrough 74 Astronomy (ISSN 0091-6358, USPS 531-350) is ONLINE published monthly by Kalmbach Publishing Co., 21027 Crossroads Circle, P. O. Box 1612, Waukesha, WI 53187–1612. Periodicals postage FAVORITES paid at Waukesha, WI, and additional offices. POSTMASTER: Send address changes to Astronomy, P.O. Box 62320, Tampa, Fla. 33662-2320. 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