Scientists pointed a giant telescope at 3I/ATLAS to scan for alien life — this is what they found

It is unclear whether a [3I/ATLAS] would transmit radio signals … such signals would take tens of thousands of years to cross ...

Alien spacecraft theory debunked for comet 3I/ATLAS

Harvard astrophysicist Avi Loeb is one of the biggest proponents of the theory that the comet was sent by an alien ...
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New research: Are radio-bright galaxies hiding alien transmitters?

Across the observable universe, galaxies advertise themselves in radio waves for familiar reasons-magnetic fields, cosmic ...