This chapter opens with a reminder that, for the past century, Earth has inadvertently broadcast our presence to more than 75 nearby star systems.
About a quarter of those stars have confirmed exoplanets orbiting in the habitable zone, and a few may harbor intelligent life capable of receiving our long-ago leaked transmissions.
But what kind of emissions are leaking into space now?
Could extraterrestrials detect our satellite pings around the globe, and could they be listening in on our cellphone conversations?
To figure out this latest leakage, a radio astronomy team is building a model of Earth’s technosignatures, the technological byproducts we radiate into space.
The last time scientists simulated Earth’s emissions, said Ramiro Saide, it looked like something out of old TV comedies.
Nowadays, billions of mobile devices stream gigabytes of content across continents, beaming an undulating pattern of broadband signatures as our planet swings through night and day.
The Search for Extrater
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