Earth's Radio Bubble: How Far Have Our Signals Traveled? Are Aliens Listening?

• Human-made radio signals, starting with Reginald Fessenden's 1906 broadcast, have created an expanding "radio bubble" in space.
• This bubble, traveling at the speed of light, now extends approximately 119 light-years from Earth.
• Despite its size, the radio bubble is a tiny fraction of the 100,000-light-year-wide Milky Way galaxy.
• Signals have passed stars like Proxima Centauri, and about 75 stars within the bubble could potentially receive them and observe Earth.
• Signals weaken significantly over distance, becoming indistinguishable from cosmic noise, making alien detection highly improbable. Modern tech also reduces leakage.

Why It Matters: Our radio signals have traveled 119 light-years, but are too weak for aliens to detect.