OBSERVING: RED PLANET 2020: JUPITER'S IO: Mystery in Saturn's Rings Spacecraft Head for Mars Volcanic Wonderland PAGE 52 PAGE 22 PAGE 14 THE ESSENTIAL GUIDE TO ASTRONOMY JULY 2020 Catch a Comet Page 36 skyandtelescope.org Stroll Through Summer's Celestial Sights See Jupiter and Saturn at Their Best Celebrating Comet HaleBopp's 25th Page 60 Page 48 Page 30http://www.skyandtelescope.org