A preprint by Japanese astrophysicist Koji Sumura, posted on arXiv.org, argues that humanity may sit at an extremely remote edge of a possible galaxy-wide communication network. Under his calculations, even if other intelligent civilizations exist, the chance of establishing contact could be close to zero if our species is located in a quiet, peripheral sector of the Milky Way. The study explores a deliberately bold scenario: advanced civilizations exist, search for one another and may have built a network spanning the Galaxy. In that framework, the absence of received messages does not prove that humanity is alone; it may instead reflect our position within the galactic system.
Key Takeaways: Sumura’s study assesses the theoretical likelihood that humanity could join a hypothetical galactic communication network. It concludes that contact prospects depend heavily on location and may be nearly negligible on the Galaxy’s periphery. The silence so far should not be treated as proof of cosmic loneliness, but as a prompt to map the galactic habitable zone and refine search strategies.
The discussion connects to the long-running Fermi paradox and the Drake equation. In the early 1960s, American astrophysicist Frank Drake proposed his famous formula for estimating the number of intelligent civilizations in the Galaxy. Current assessments indicate that the Milky Way contains billions of Sun-like yellow dwarf stars, which shine for billions of years and produce relatively weak flares. Even conservative estimates suggest that around millions of such stars there may be rocky planets where liquid water could persist for long periods. That gap between the expected abundance of habitable environments and the lack of observed contact is captured by the Fermi question: ‘Where is everybody?’
Sumura, a researcher at the Institute for Advanced Interdisciplinary Research affiliated with Tohoku University, starts from an ambitious assumption: other intelligent civilizations are real, they seek one another and may even have created a communication network covering the entire Galaxy. The key question then becomes how easily a single civilization—such as humanity—could connect to that network. In the preprint, the researcher explains that the probability depends largely on where a civilization is located. A civilization could inhabit such a remote part of the Galaxy that hope of finding interlocutors is almost nonexistent. Humanity therefore needs to establish whether it, too, has been left in such a peripheral zone of the Milky Way.
Answering that question requires defining the boundaries of the galactic habitable zone—the region where complex life has the highest probability of emerging and developing over long timescales. Three main conditions must be met: stars rich in heavy elements, sufficiently long stellar lifetimes, and no nearby supernova explosions. The first two conditions are better satisfied closer to the galactic center, while the third favors quieter outskirts. Future work is expected to focus on mapping these boundaries, assessing humanity’s place in any potential galactic network and refining strategies for the search for extraterrestrial intelligence.
Source: kun.uz