(13.800 Million years ago. On our 100 year time-scale it should be year -176. Can't be used so +20)
According to modern scientific evidence, the most probable theory is that the Cosmos, the whole Universe with everything in it: energy, space, matter and even time started with a (the) Big Bang. This video illustrates that Big Bang, the formation of the first particles and elements, up to the whole of the Universe with all the stars, galaxies and planets.