Wissenschaftler nutzen das Allen Telescope Array, um im Sternensystem TRAPPIST-1 nach Radiosignalen zu suchen

TRAPPIST-1 is approximately 40ly away from Earth, it’s my understanding that even the most extreme high-power narrowband terrestrial radio signals would only be detectable within a range of up to 10ly away, and at the end of that range only with a receiver network as capable as the Square Kilometre Array

Some of the most powerful non-narrowband radio signals we can generate with our current <5MW transmitters are pretty much decayed at a distance of ‘just’ 2ly out, by the time those signals reached TRAPPIST-1 they would be ~400x fainter than they would be at the point of becoming indistinguishable from background noise from most receivers

Even a highly narrowband signal like the Arecibo Message would still suffer significant information loss over that distance, and appreciate it as an effort at communicating would depend on the listeners also having some pretty capable receiver arrays

In other words, I don’t find this negative result – along with most negative results – remotely discouraging, all it really demonstrates is that potential ETI wasn’t attempting to ping us using gigawatt transmitters carrying strongly narrowband messaging