With the increasing use of mobile phones, the Manchester team discovered that the global mobile phone network radiates a peak power of about 4 GW into space, which can be detected by a highly sophisticated radio telescope.

Interestingly, the uneven distribution and design of mobile devices transmitting a signal parallel to the horizon can provide the observer with information about the Earth’s surface, including the distribution of seas and land, vegetation and even cartography. Although some researchers argue that the Earth is getting increasingly quiet, the proliferation of cell phone systems around the world means that Earth is already abnormally bright in the radio spectrum.

This trend is expected to continue with more than 100,000 satellites in low Earth orbit and beyond by the end of the decade.

Source: Ferra

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