Galaxies like our Milky Way and Andromeda are still evolving in the present Universe, despite reaching a relative equilibrium billions of years ago. In order to illustrate how galaxies were formed and evolved since the Big Bang, NASA created this fantastic simulation – you really should watch it.
Andrei's background is in geophysics, and he's been fascinated by it ever since he was a child. Feeling that there is a gap between scientists and the general audience, he started ZME Science -- and the results are what you see today.