is a system of imaging atmospheric Cherenkov telescopes (IACTs) for the investigation of cosmic gamma rays in the photon energy range of 0.03 to 100 TeV.

permits the exploration of gamma-ray sources with intensities at a level of a few thousandth parts of the flux of the Crab Nebula.

Gamma-ray producing sources include supernova remnants, active galactic nuclei and pulsar wind nebulae.

is located in the Khomas highlands of Namibia near the Gamsberg mountain, an area well known for its excellent optical quality.

[2] In 2016, the HESS collaboration reported deep gamma ray observations which show the presence of petaelectronvolt-protons originating from the supermassive black hole at the centre of the Milky Way,[3] and therefore should be considered as a viable alternative to supernova remnants as a source of petaelectronvolt galactic cosmic rays.