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Astronomers are investigating a mysterious radio wave from Proxima Centauri, the nearest star to the sun, in their search for extra-terrestrial life.
The signal was detected by the Parkes telescope in Australia in April and May 2019, with scientists unable to find a source of the waves that could come from Earth.
The frequency is around 980MHz and is particularly narrow, with the changes in frequency consistent with the movement of the planet,
Scientists are preparing a paper on the signal, which has been named BLC1 (Breakthrough Listen), but have stressed that it is unlikely to be caused by aliens.