Mobile phones are so ubiquitous that we typically don't think about how they work.
But the key to their function is a vast array of radio transmission towers.
With all those cell towers emitting all those radio signals, a fun question to ask is whether those signals could be detected by an alien civilization.Monthly Notices of the Royal Astronomical Society Now those transmissions are dwarfed by those of mobile communications. Military radar transmissions are still the most powerful source of Earth's radio leakage, but cell towers now fill the second position.
If we assume an alien civilization has sophisticated radio astronomy, similar to our Event Horizon Telescope, then our transmissions should be detectable within a dozen light-years or so.
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