Created By : awnish

Reviewed By : Phani Ponnapalli

Last Updated : Apr 10, 2023

Alien Civilization Calculator is one of the best tools that help to analyse the number of civilizations in our galaxy. It takes the help of either the Darke equation or the Astrobiological Copernican Limits method to find the answer. You have to select one model, provide required input details in the milky way assumptions and hit the calculate button to check the number of civilizations in the result section in a less amount of time.



Steps to Find Number of Active Extraterrestrial Civilizations

The following are the simple steps to calculate the number of alien civilizations in a milky way using two methods drake equation and the astrobiological copernican principle.

Drake Equation:

  • Get the required details from the question.
  • Multiply all the parameters.
  • Otherwise, substitute the values in the drake equation formula and solve to get the count of active extraterrestrial civilizations.

Astrobiological Copernican Principle:

  • Get the number of stars in the galaxy, the average lifetime of a civilization, and other details.
  • Divide the average lifetime of civilization by the average amount of time available for life to develop on the planet.
  • Multiply all the other parameters together.
  • Find the product of the result with the value in step 2 to check the number of civilizations in a milky way.

The Astrobiological Copernican Principle

The famous astronomer's Tom Westby and Christopher J. Conselice have published a new research paper in the Astrophysical Journal saying that there might be at least 5 other civilizations sharing the Milky way. So, we use this Astrobiological Copernican Limits method to find the total number of advanced civilizations. It is the most recent method that was developed.

The Astrobiological Copernican Principle equation can be defined as N = N* * fL * fHZ * fM * (L/τ')


N is the number of intelligent and communicable civilizations in the galaxy

N* is the total number of stars in the galaxy

L is the average lifetime of an advanced, communicable civilization

fHZ is the percentage of stars that host a suitable planet for supporting life

fL is the percentage of stars that are at least 5 billion years old

fM is the percentage of stars for which there is a sufficient amount of mental resources allowing the formation of advanced biology and communicable civilization

τ' is the time in which life ould exist

Drake Equation to Find Number of Alien Civilizations

It is one of the popular ways to calculate the number of active extraterrestrial civilizations in the galaxy. Its simple formula is the multiplication of all the parameters. It was developed by Frank Drake to get the number of detectable civilizations in our universe.

The simple formula of Drake equation is N = R* * fp * ne * fl * fs * ft * L


R* is the average rate of star formation in the space

ne is the average number of hospitable planets per star

fp is the percentage of stars that have at least one planet

fl is the percentage of planets where life actually emerges

fs is the percentage of planets where life evolves into intelligent beings

L is the lifetime civilizations remains detectable

ft is the percentage of planets with intelligent creatures capable of interstellar communication

Chance of Existence of Aliens within the Distance from the Earth

With the help of results from the Drake equation or Astrological Copernical Limits, we can estimate the probability of an alien civilization at closer distances.

It uses the volume of the cylinder, maximum volume in the space to find the probability. Its formulas are along the lines:

P = Vsearch/Vmax


Vsearch s the search space volume

Vmax is the maximum volume

P is the probability of distance

Exotica Catalog | Existence of Aliens

Do you need evidence for extraterrestrial life? What are the objects to be targeted to increase the chances of meeting aliens? The new Exotica Catalog has a list of 700 objects of interest to scientists looking for technosignatures.

It is divided into four categories. They are

  • Prototypes: It is a sample having one of each type of every known kind of object like moon, planets, stars, galaxies and many more
  • Anomalies: It has a list of objects with behaviour that isn't described. The examples are stars that emit excess infrared radiation
  • Superlatives: THe examples of objects with the most extreme properties are stars with high metal content, hottest planet or densest galaxy.
  • Control Sample: These are objects that are unphysical or nonexistent.

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