ExoMars: SEARCHING FOR LIFE ON THE RED PLANET p. 22 DIY: A TINY 8-INCH TRAVEL SCOPE p. 72 Observing: COOL OBJECTS IN THE AUTUMN SKY p. 32 T H E E S S E N T I A L G U I D E TO A S T R O N O M Y George Ritchey's Giant Telescope Adventures p. 66 What Caused Eta Carinae's Great Eruption? p. 26 OCTOBER 2016 Amazing Pluto A LITTLE WORLD with BIG SURPRISES p. 14 Test Report: Atik's Observing Video Camera p. 58 Binocular Highlight: Cascade of Stars in Cepheus p. 43