Researcher warns that four alien civilizations could attack or invade Earth

Most of us are familiar with alien invasions in movies. We have enjoyed such action including the battle scenes in the first part of Avengers. Loki and Chitauri army coming to conquer the world from an alien planet and fighting that battle with the Avengers is one of the most famous in Hollywood cinema. But this is something nobody would want to happen in real life.

Alberto Caballero, a PhD student at the University of Vigo in Spain, says in his study that there are four extraterrestrial life-forms in our Milky Way galaxy that could invade the Earth. Recently, there were some reports that we had received a radio message from outside the Earth in 1977. The message was received by the Ohio State University's Big Ear Telescope. The scientists also found that the radio message, which was one minute and 12 seconds long, contained an alpha numeric code. Scientists call it the WoW signal. The message was received in 1977 but was never released by scientists.

Scientists have been trying to trace the source of this message for decades. But a clear picture has not yet been obtained, but Alberto claims to have found the source of the message. According to Alberto, it originated from a sun-like star 1,800 light-years away.

Our scientists also send messages to find extraterrestrial life. They are called galaxy beacons. Scientists hoped that this beacon will create a channel for communication between humans and aliens on Earth. But in his paper, Alberto also warns that such messages can be dangerous. The main purpose of the study is to find out the number of alien communities that are likely to approach Earth following these messages. The study says that about four such communities could attack or invade the planet. According to Alberto, such an event is only likely to occur in about 100 million years, and therefore humans would be safe today.

"Sending messages (METI, or "Messaging Extraterrestrial Intelligence") to space is not very safe. Scientists need to be careful about that", he told a media outlet.