This is how far human radio broadcasts have reached into the galaxy http://www.planetary.org/blogs/emily-lakdawalla/2012/3390.html http://www.planetary.org/blo

This is how far human radio broadcasts have reached into the galaxy http://www.planetary.org/blogs/emily-lakdawalla/2012/3390.html http://www.planetary.org/blogs/emily-lakdawalla/2012/3390.ht...