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Found in data from the world's largest radio telescope in China.
A narrow frequency line that shifted gradually over time in reanalyzed data.
1,148
MHz, where the signal appeared while the dish was aimed at K2-155.
1
Central beam
18
Other beams
Nothing similar appeared in the other beams, which scanned nearby sky.
do not establish the signal’s origin
The researchers, in The Astronomical Journal
Strong in one of two reception channels, a possible sign of receiver trouble.
Keep going
Three other star systems showed similar signals at nearby frequencies.
The machine-learning screen, the Doppler shift and the signs of human interference.
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