A mysterious radio signal from our nearest stellar neighbour, Proxima Centauri, is being 'carefully investigated' by a team of alien-hunting astronomers. Researchers from the Breakthrough Listen Project – a £70m initiative to find alien life through radio telescopes – have been studying the radio waves since April 2019. Proxima Centauri is 4.2 light years from Earth and has two confirmed planets, a Jupiter-like gas giant and a rocky world called Proxima b in the habitable zone. The signal was spotted by the Parkes radio telescope in Australia in April or May 2020, according to a report in The Guardian, and, unlike previous radio bursts hasn't been attributed to any Earth-based or near-Earth human-created source.