Earth's Radio Bubble: Every signal we've ever sent into space

Earth's electromagnetic radiation has been expanding outward at the speed of light since the early 1900s, creating a "radio bubble" now roughly 240 light-years across containing every broadcast, transmission, and radar signal we've sent into space. Though this sphere is enormous—spanning 2,270 trillion kilometers—it represents only 0.000002% of the Milky Way, making humanity's cosmic announcement vanishingly small on a galactic scale. Major broadcast milestones like the 1936 Berlin Olympics and 1969 Moon landing transmissions continue traveling outward indefinitely, gradually weakening as they propagate through distant star systems.