If alien signals have already reached Earth, why haven't we seen them?

For decades, scientists have searched the skies for signs of extraterrestrial technology. A study from EPFL asks a sharp ...

Did alien signals reach Earth? If they did, why have they gone undetected

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WESA

'Alien' Signal Source Reportedly Located (It Wasn't The Vulcans)

If it were a phone call, we might call it a butt dial: A strong radio signal that set off questions about whether it emanated from an advanced alien race earlier this week is now believed to have come ...
New Scientist

Search for radio signals finds no hint of alien civilisation on K2-18b

Planet K2-18b, an apparent water world 124 light years away, has been seen as a promising location in the search for aliens, ...
AOL

Aliens could be chatting with each other in plain sight using light flashes like fireflies, scientists say

Advanced aliens could be chatting with each other using light flashes in plain sight, similar to how fireflies communicate, according to a new study that could lead to new approaches in finding ...
Knowridge Science Report

Why we may still be waiting for an alien signal

Since the first Search for Extraterrestrial Intelligence (SETI) experiment in 1960, scientists have been scanning the Milky ...