With Big Bang, the universe sent out light for the first time and since then there has been no actual darkness out there because photons, the light particles, can be caught at all wave lengths. However, the universe still contains the astrophysical paradox of dark matter, a missing mass, which can only be detected by looking at bright matter. This dark matter seem to have been present in the universe even before the Big Bang as an invisible pre-material – at the same time fundamental and incomprehensible. Without darkness we wouldn’t be able to see the light.