[OC] I visualized every human radio signal ever sent, our bubble is 240 light-years wide but effectively invisible to anyone inside it

Right now a sphere of electromagnetic radiation is expanding from Earth at the speed of light. It has been growing since the 1930s when our signals first became powerful enough to escape the ionosphere. I plotted it using real stellar positions from the HIPPARCOS catalogue nearby stars at their actual distances, with concentric rings marking [...]