Physics results and physics potential of ground-based γ-ray astronomy

Since the discovery of the Crab nebula as an emitter of very high-energy γ-rays in 1989, ground-based γ-rays astronomy has opened a unique window to the high-energy physical proceses occuring in the near and distant universe. Some recent physics results will be presented. Currently, a new generation of Imaging Air Cherenkov Telescopes is under construction in several locations on the northern and southern hemisphere. Based on the expected performance of the MAGIC Telescope a significant enhancement of the physics prospects of ground-based γ-ray astronomy is indicated.