The peoples of the megaliths, there are several thousands of years, already practiced astronomy , like the great ancient civilizations of China and Egypt . Since these observations have continued and have been a constant source of discoveries about the solar system , our galaxy and the universe. However, these observations were based on the same physical source , electromagnetic waves . It was light at first, then other regions of the spectrum such as radio waves or X-rays
With the observation by the IceCube collaboration neutrinos coming in all probability an astrophysical source , we are entering a new era where the neutrinos are also used to observe the universe. If we consider a very distant source, a photon ( a particle of light) emitted by this source could be absorbed along the way.
