Astronomy 2018-09.pdf

MyScienceSHuge selection!Books Magazines Globes&Maps Posters Downloads And more!P29014SHOP NOW FORSCIENCE&ASTRONOMY PRODUCTSSEPTEMBER 2018 www.AVol.46 Issue 9Ancient coins capture solar eclipses p.32BOB BERMAN on the barely visible universe p.12Celestial treats in the NGC catalog p.54WE TEST Vixens HR eyepieces p.60Ask Astro,Astro News,Reader Gallery AND MOREPLUSEXCLUSIVE PHOTO GALLERY NEW VIEWSOF MARSMust-see images from HiRISE p.20EXPERIENCE the birth of astrophysics p.44The worlds best-selling astronomy magazineBONUS ONLINE CONTENT CODE p.4BONUS ONLINE CONTENT CODE p.4For over 25 years,The Great Courses has brought the worlds foremost educators to millions who want to go deeper into the subjects that matter most.No exams.No homework.Just a world of knowledge available anytime,anywhere.Download or stream to your laptop or PC,or use our free apps for iPad,iPhone,Android,Kindle Fire,or Roku.Over 600 courses available at www.TheGreatC.The Theory of Everything:The Quest to Explain All RealityTaught by Professor Don LincolnFERMI NATIONAL ACCELERATOR LABORATORYLECTURE TITLES1.Two Prototype Theories of Everything2.The Union of Electricity and Magnetism3.Particles and Waves:The Quantum World4.Einstein Unifi es Space,Time,and Light5.Relativistic Quantum Fields and Feynman6.Neutrinos Violating Parity and the Weak Force7.Flavor Changes via the Weak Force8.Electroweak Unifi cation via the Higgs Field9.Quarks,Color,and the Strong Force10.Standard Model Triumphs and Challenges11.How Neutrino Identity Oscillates12.Conservation Laws and Symmetry:Emmy Noether13.Theoretical Symmetries and Mathematics14.Balancing Force and Matter:Supersymmetry15.Why Quarks and Leptons?16.Newtons Gravity Unifi es Earth and Sky17.Einsteins Gravity Bends Space-Time18.What Holds Each Galaxy Together:Dark Matter19.What Pushes the Universe Apart:Dark Energy20.Quantum Gravity:Einstein,Strings,and Loops21.From Weak Gravity to Extra Dimensions22.Big Bang and Infl ation Explain Our Universe23.Free Parameters and Other Universes24.Toward a Final Theory of EverythingThe Theory of Everything:The Quest to Explain All RealityCourse no.1318|24 lectures(30 minutes/lecture)Join the Quest to Explain Everything There IsAt the end of his career,Albert Einstein was pursuing a dream far more ambitious than the theory of relativity.He was trying to find an equation that explained all physical realitya theory of everything.He failed,but others have taken up the challenge in a remarkable quest that is shedding light on unsuspected secrets of the cosmos.Experimental physicist and award-winning educator Dr.Don Lincoln of the world-renowned Fermi National Accelerator Laboratory takes you on this exciting journey in The Theory of Everything:The Quest to Explain All Reality.Ranging across time and space,and at scales ranging from the subatomic to the cosmicand even into extra dimensions,with these 24 lectures you will bridge the eras between classical and modern physics and get a glimpse of the goal that has motivated physicists for centuries.Its a dazzling trip!Of er expires 09/30/18THEGREATCOURSES.COM/9ASTR1-800-832-2412LIMITED TIME OFFERORDER BY SEPTEMBER 3070%offSAVE UP TO$190DVD$269.95 NOW$79.95Video Download$234.95 NOW$59.95+$10 Shipping&Processing(DVD only)and Lifetime Satisfaction GuaranteePriority Code:162523CONTENTSPicture of the DayGorgeous photos from our readers.Ask Astro Archives Answers to all your cosmic questions.Sky This Week A daily digest of celestial events.Trips and ToursTravel the world with the staff of Astronomy.4 ASTRONOMY SEPTEMBER 201820 COVER STORYTake control of a Mars orbiter Imagine directing the highest resolution camera orbiting the Red Planet.hat wish can now be a reality.ALFRED MCEWEN32Minting a celestial memory Coins made as far back as 400 b.c.may honor solar eclipses.he tradition continued for two millennia.RICHARD JAKIEL36Sky This MonthNeptune at its best.MARTIN RATCLIFFE AND ALISTER LING38StarDome and Path of the PlanetsRICHARD TALCOTT;ILLUSTRATIONS BY ROEN KELLY44How William Huggins shaped astrophysics In 1868,an English astronomer pioneered a way to measure the motion of stars and other objects.BARBARA J.BECKER54An NGC primer he most extensive list of deep-sky objects has an unusual history and ofers prime-number gems for observers.ALAN GOLDSTEIN60We test Vixens HR eyepieces hese high-resolution eyepieces,speciically designed for planetary observing,minimize optical aberrations.PHIL HARRINGTON70Ask AstroImaging exoplanets.COLUMNSStrange Universe 12BOB BERMANFor Your Consideration 16JEFF HESTERSecret Sky 64STEPHEN JAMES OMEARABinocular Universe 66PHIL HARRINGTONObserving Basics 68GLENN CHAPLEQUANTUM GRAVITYSnapshot 9Astro News 10 IN EVERY ISSUEFrom the Editor 6 Astro Letters 8 New Products 62Advertiser Index 65Reader Gallery 72Breakthrough 74FEATURESSEPTEMBER 2018VOL.46,NO.954Astronomy(ISSN 0091-6358,USPS 531-350)is published monthly by Kalmbach Media Co.,21027 Crossroads Circle,P.O.Box 1612,Waukesha,WI 531871612.Periodicals post