This is how far human radio broadcasts have reached into the galaxy
Sección: Astronomía Machadines y Exploración Espacial
Creado: 31-07-19 (Actualizado: 11-08-19)
There is an ever-expanding bubble announcing Humanity's presence to anyone listening in the Milky Way.
http://www.planetary.org/blogs/emily-lakdawalla/2012/3390.html