Computer simulations of the dark matter make visible, how - as time elapses - large scale structures are formed from small density fluctuations.

Astrophysicists use a time scale, which is related to the so called cosmological redshift, and counts backward: The simulation starts with z=28,6 where the universe was only a few hundred millions old. The value z=0 corresponds to today, with the age of the universe being 13,7 billion years.