KOSMOS_Rafal..::Radio Radius

article-0-11ef84ab000005dc-183_964x959 Humans have 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. 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)?  It’s not the square; it’s the little yellow dot at the center of that zoomed-in square

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