From infrared to gamma rays
This diagram shows the same celestial object – the Crab nebula – as seen by different types of photons: infrared, visible light, X-rays and gamma rays. All these photons have the same nature, though their wavelengths (which define the colour in the visible part of the spectrum) and energies are different. The image taken with high-energy gamma rays was obtained thanks to the 4-telescope setup of the HESS experiment, used to identify and measure the direction of high-energy gamma rays.