There may be four extraterrestrial civilizations in the Milky Way that could attack our planet, a researcher has claimed.
Alberto Caballero, a PhD student at the University of Vigo in Spain, authored a study in the International Journal of Astrobiology earlier this month in which he claimed that he pinpointed the so-called “WoW! Signal.”
The signal, which was first detected by a radio telescope in 1977, was a strange minute-long burst of radio energy that may have originated from a Sun-like star 1,800 lightyears from the Earth, according to Caballero.
