Why aliens don't attack Earth – the Fermi paradox solved
A new study offers an explanation for the Fermi paradox: the lack of traces of extraterrestrial civilizations is linked to insufficient photosynthesis energy on nearby exoplanets, which limits biological evolution to simple microorganisms.
A new study published in the International Journal of Astrobiology offers an explanation for the Fermi paradox — the absence of observable traces of extraterrestrial civilizations. Scientists analyzed 29 rocky exoplanets within 40 light-years of Earth. They concluded that the key factor limiting biological evolution is not the planet's age, but the total annual photosynthesis output. Most potentially habitable planets near the Solar System orbit dim red dwarfs and receive insufficient radiant energy. Additionally, many are tidally locked, further restricting the zone suitable for photosynthesis. According to the study, if life exists on these planets, it is likely limited to simple microorganisms. This explains why humanity does not receive radio signals and why there is no need to fear interstellar invasion.