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Scientists assert that there are at least 36 intelligent alien civilizations in our galaxy


In 2020, British astrophysicists released a captivating study suggesting the presence of approximately 36 intelligent civilizations within our Milky Way. But this number is more complicated than it first appears. Here’s a shortened and optimized take on the subject.

Breaking Down the Nottingham Study


Astrophysicists from the University of Nottingham conducted calculations to estimate the likelihood of extraterrestrial intelligent life in our galaxy. While every celestial entity, from planets to black holes, exhibits uniqueness, some patterns do exist. For example, certain structures, physical quantities, and relations recur in the universe. This provides a basis for predicting the existence of life elsewhere.

Milky Way’s Potential for Life

With a staggering diameter of about 100,000 light years, our Milky Way is vast. It houses an estimated 100 to 400 billion stars, countless planets, and numerous smaller celestial bodies. Researchers have identified around twenty thousand Earth-like planets in the Milky Way. That’s a huge number of potential homes for life. But remember, these numbers are based on observations and models – not concrete evidence.

Assumptions of the Study

The study assumed that it would take about 4.5 billion years for intelligent life to develop, mirroring Earth’s timeline. They defined “intelligent life” as a civilization capable of higher communication and space exploration. They also postulated that a civilization should last at least 100 years, based on Earth’s technological history.

Moreover, the content of metals in stars was considered crucial. On Earth, the discovery of metals jumpstarted technological development.

Factoring all these parameters, the magic number 36 was derived – suggesting that many intelligent civilizations might be out there.

Criticism and Rebuttal

The astrophysical community was abuzz with debate following the study’s release. Critics found the study speculative, while its proponents clarified that it wasn’t about presenting indisputable facts. Instead, the study aimed to evolve the “cosmic yardstick,” labelling their approach as the “astrobiological Copernican frontier.” The underlying intention was to reflect on our civilization’s probable continuation based on these cosmic calculations.

A Deeper Dive into the Study’s Implications

Here are some thought-provoking points from the study:

  1. If the 36 SETI civilizations exist, they’re likely around 17,000 light-years away. Messages sent to them would be ancient by the time of receipt.
  2. Our technology for sending/receiving signals is just over a century old. What if another civilization tried to contact us millennia ago?
  3. Maybe there are civilizations whose technologies differ from ours, and we simply can’t detect their signals.
  4. Not all space civilizations may wish to contact us, or even possess the means to do so.
  5. The rate of evolution and dependence on metals might differ in other worlds.
  6. Is humanity’s current state really a benchmark for cosmic evolution, especially given our self-destructive tendencies?


Exploring the potential existence of intelligent life in the universe is a complex and fascinating endeavor. It raises many questions and generates numerous opinions. Such studies, while expensive, fuel our understanding and imagination. What are your thoughts on the matter? Could your tax dollars be better spent elsewhere? Join the conversation below, and stay tuned for more insights from Simply Space!