Regular Universe

The Universe came into existence between 12 and 20 billion years agon in an event known as the Big Bang. From a singularity (an energy density) on the scale of the Planck length (10−33) the universe rapidly expanded and has been doing so ever since. The universe is far from infinite in size, but is extremely large, mainly filled with vacuum and quantum fluctuations. There are countless millions of galaxies within the universe, of which ours, the Milky Way is only one.