This German-language only site offers over a hundred fifteen-minute introductory lectures by Dr Harald Lesch on various aspects of astronomy and astrophysics. The videos, which are aimed at students and mostly feature Lesch speaking in front of a blackboard, cover such topics as the Big Bang, Asteroids, Pulsars, Quasars, Terraforming and even Star Trek. Large quantities of additional content can now be found in the Mediathek section