On Wed, 26 Sep 2018 12:07:27 -0700 (PDT), Gary Harnagel
wrote:
As I said, it only takes ONE civilization to make it. It can then
spread
to other galaxies in a few million years, a very short time in the
universe=

You are hopelessly overoptimistic. The typical distance between
galaxies is millions of light years or more. Therefore you are saying
that any civilisation would with great probability learn interstellar
travel at or near light speed. Are you even aware of the difficulties
involved? For instance, colliding with a grain of sand near light
speed would mean the end of your expedition.