In 1895 scientists succeeded in creating a so-called black body: a sort of hollow space that absorbs all the electromagnetic radiation that falls into it, and emits light in a specific spectral distribution related to its temperature. The radiation spectrum emitted changes depending on the temperature the body reaches, and indicates the distribution of energy over the various colours of thermal or light radiation. The classical theory of radiation predicts that energy in black bodies must be infinite, but it cannot explain the actual measurement results. Max Planck, on the other hand, succeeded in putting forward a formula in 1900 that reflected the measurement results exactly. In 1918 he received the Nobel Prize in physics for this work.