New Horizons - Mountains on Pluto Beginner 07/30/2015 New Horizons - Surface of Pluto Beginner 07/30/2015 New Horizons - Team Reacts to Images Beginner 07/30/2015 Pluto via New Horizons Spacecraft Intermediate 07/14/2015 Dortmund-Ems Canal Advanced 06/21/2015 The Philae Lander – Chemistry on a Comet Intermediate 06/18/2015 Rosetta's Philae touchdown Intermediate 06/17/2015 Horsehead Nebula Advanced 06/08/2015 VLA radio telescope Beginner 05/04/2015 La silla telescope ring Intermediate 05/04/2015