This is a really interesting little snippet on the vastness of the universe and how little we have yet looked into our own galaxy.
"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)?
To answer that question, I put together the following diagram of our galaxy with the “Humanity Bubble” embedded within it."
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