Earth's Expanding Radio Bubble: How Humanity's Signals Are Reaching the Cosmos
By
jonbaer
Kettled twice. Extra chewy, extra trustworthy.
Summary
This article explores the concept of Earth's "radio bubble" — a sphere of electromagnetic radiation expanding outward at the speed of light since the early 1900s, now roughly 240 light-years across. It contains every radio transmission, TV broadcast, radar ping, and deliberate message humanity has ever sent into space. The article discusses the implications for potential extraterrestrial civilizations detecting our signals, the humbling scale of this phenomenon, and what our unintentional broadcast says about humanity's presence in the cosmos.
Key quotes
· 4 pulledRight now, a sphere of electromagnetic radiation is expanding outward from Earth at the speed of light.
It has been growing since the first powerful radio transmissions of the early 1900s.
To any civilisation with a sufficiently sensitive receiver sitting within that bubble, we have already announced ourselves.
The numbers are simultaneously humbling and staggering.
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