Scientists involved in a project in search of alien life are now investigating a mysterious radio wave signal that appears to have come from Proxima Centauri, the closest star to the sun. The Guardian reported the finding Friday, writing that the emission was picked up during 30 hours of observations by the Parkes telescope in Australia in April and May last year. Scientists working on the Breakthrough Listen Project have been investigating the emission since its detection, although the source still remains unclear. However, the Guardian reported that scientists found a shift in the beam’s frequency is consistent with the movement of a planet.