EXPLORING THE MOON: OBSERVING: TEST REPORT: Our Satellite's Cold Spot The Blue Snowball Nebula Sharpstar's Fast Astrograph PAGE 52 PAGE 62 PAGE 68 THE ESSENTIAL GUIDE TO ASTRONOMY SEPTEMBER 2020 The Fate of Volcanic Worlds Dating a Vermeer Masterpiece Page 24 Page 18 Hunting for Alien Moons Page 34 Make Your Own Eyepieces Page 74 skyandtelescope.orghttp://www.skyandtelescope.org