AMATEUR ASTRONOMY: 50 Years at Riverside ENIGMATIC JEWELS: Observing Variable Nebulae PAGE 64 PAGE 22 S&T TEST REPORT: Mega Monochrome CCD Camera PAGE 58 THE ESSENTIAL GUIDE TO ASTRONOMY GRAVITY & LIGHT: WHEN NEUTRON STARS COLLIDE PAGE 32 Astronomy from 100,000 Feet PAGE 14 How To Collimate Your Schmidt-Cass Scope PAGE 28 FEBRUARY 2018 February's Missing Moon PAGE 84 Targets for the Hunter skyandtelescope.com PAGE 54http://www.skyandtelescope.com