An unusual pulse signal has been detected in the light of nearby stars — and it's left scientists scratching their heads, a study searching for extraterrestrial intelligence finds.
The pulses saw the stars become fainter and brighter in a fraction of a second, suggesting that something passed in front of — and partially obscured — the stars' light. This doesn't mean aliens were zooming by in spaceships, but unknown alien activity is one of several possible explanations left on the table by the researcher who detected the signal.
