EXPLORATION: 65 Space Missions ECLIPSE: When the Sun Across the Solar System Went Dark Over Broadway PAGE 22 PAGE 66 OBSERVING: Probe the Pleiades in Depth PAGE 60 THE ESSENTIAL GUIDE TO ASTRONOMY THE FIRST BLACK HOLES How They Formed & Why It Matters PAGE 24 28 Hot Products for 2017 PAGE 32 VENUS: Tricks of Light When It's Half-Lit PAGE 52 JANUARY 2017 skyandtelescope.comhttp://www.skyandtelescope.com