Look for the tiny blue dot for our impact. Adam Grossman writes
about “The Tiny Humanity Bubble” on jackadamblog: Mankind has
been broadcasting radio waves into deep space for about a
hundred years now — since the days of Marconi. That, of course,
means there is an ever-expanding bubble announcing Humanity’s
presence to anyone listening in the Milky Way. This bubble is
astronomically large (literally), and currently spans
approximately 200 light years across. But how big is this,
really, compared to the size of the Galaxy in which we live
(which is, itself, just one of countless billions of galaxies in
the observable universe)?