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> Our work also returned eight promising extraterrestrial intelligence signals of interest not previously identified. Re-observations on these targets have so far not resulted in re-detections of signals with similar morphology.

Are there other promising leads for alien civilizations?

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There's been many such signals detected over the years, the issue is that the majority of SETI work seems focused specifically on only detecting intentional communication, i.e. high powered beacons set up to explicitly attract attention. That's why there's talk around whether the signals repeat, since they would in an intentional beacon that's constantly pulsing out a message. Of the signals that are captured that look suspicious, but don't repeat, some portion of them can be traced back to RFI, but the rest that don't have an explanation are just ignored since they don't repeat.

...and what would those look like?

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