BLC1

[6] Although the signal was detected by Parkes Radio Telescope during observations of Proxima Centauri, due to the beam angle of Parkes Radio telescope, the signal would be more accurately described as having come from within a circle roughly 16 arcminutes (approximately 1/4 of a degree, half the angular width of Earth's moon) in angular diameter, containing Proxima Centauri,[6] so the signal could have originated elsewhere in the Alpha Centauri system.

[4] The radio signal was detected during 30 hours of observations conducted by Breakthrough Listen through the Parkes Observatory in Australia in April and May 2019.

Their finding has not been put in direct relation to the BLC1 signal by scientists or media outlets as of January 2021 but implies that planets around Proxima Centauri and other red dwarfs are uninhabitable for humans and other currently known organisms.

[11][12][13] In February 2021, a new study proposed that, as the probability of a radio-transmitting civilization emerging on the Sun's closest stellar neighbour was calculated to be approximately 10−8, the Copernican principle made BLC1 very unlikely to be a technological radio signal from the Alpha Centauri System.

[14] On 25 October 2021, researchers published two studies concluding that the signal is unlikely to be a technosignature due to its similarity to previously detected terrestrial interference.