190 million, but your point remains. Exponential growth is surprising even when you understand it. The fact we don't see the galaxy teeming with life is either

190 million, but your point remains. Exponential growth is surprising even when you understand it. The fact we don't see the galaxy teeming with life is either 1) intelligent life inevitably evolves rapidly into something unrecognisable 2) we are unique, and not just in our galaxy. Once you hit galactic scale civilisation, neighbouring galaxies don't take long 3) we are part of that expansion