Throughout history, humans have never been contacted by extraterrestrial life. However, statistically, it is believed that Earth is not alone in the universe. With so much space to scan, there is a possibility that Earth simply lies in a bubble without any radio waves emitted by extraterrestrial life. This theory has been proposed by Claudio Grimaldi, a researcher from the Laboratory of Statistical Biophysics at the École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland.
The search for extraterrestrial intelligence (SETI) requires time, money, and effort. There is some debate as to whether or not SETI is worth pursuing. Grimaldi’s research model starts with the assumption that there is at least one electromagnetic signal of technological origin in the Milky Way at any given time, and that Earth has been in a quiet bubble for at least six decades.
Probability and the Possibility of Alien Life
There are fewer than one to five electromagnetic emissions per century anywhere in the galaxy. That is to say that they are as common as supernovas in the Milky Way, which is not very common at all. Grimaldi suggests that it could be at least 60 years before we get a hit on an alien transmission in the most optimistic scenario. In the least optimistic scenario, we are looking at a wait of around 2,000 years.
Grimaldi suggests that the best way forward is commensal investigations. This means looking for signals in data collected by telescopes that are focused on other missions, rather than using telescopes specifically to look for alien communications. The best strategy might be using data from other astrophysical studies to see if they contain any technosignals.
As telescopes continue to improve, more planets are discovered that may have the right conditions for life to exist. Therefore, it is important to continue modeling and figuring out where to look. An alien civilization may be clustered around a group of planets and not evenly spread out as the study assumed.
In conclusion, the search for extraterrestrial life is ongoing, and the possibility of alien life is statistically high. Although we may be in a radio silence bubble, it is important to continue scanning the universe for signs of life. We may have to wait a long time, but the search may be worth it in the end.