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Contact with aliens using one star in the center of the Milky Way

At the moment, the search for extraterrestrial intelligence continues. But scientists have yet to find any convincing evidence of the existence of a signal from an extraterrestrial civilization.

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Signals from aliens can come from any part of our galaxy and at any frequency. But limiting the search space for this signal will help detect the signal itself, according to scientists from Kyoto University, Japan, reports Universe Today.

One of the most famous examples of attempts to communicate with potential aliens is the Arecibo message, in which humanity attempted to announce its existence using scientific and mathematical standards.

This signal was sent in the form of a binary code back in 1975 in the direction of the globular star cluster Messier 13, located in our galaxy. The likelihood that any extraterrestrial civilization can both receive and interpret such signals is very small.

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It would be great if potential aliens had a clue to interpret the signal. But how can you pass a key to unlock a message without the key itself being interpreted only by the same key? Japanese scientists have spent a lot of time thinking about this question.

In past research, scientists have proposed using the timing of a future binary star merger or a past supernova explosion to narrow the region of space for potential contact. But a new study suggests using the orbital period of a very bright star around the Milky Way’s supermassive black hole.

The supermassive black hole at the center of our galaxy, known as Sagittarius A*, will be well known to any alien civilization that, like us, sends signals into space.

It is very convenient that several very bright stars revolve around this black hole at regular intervals. The study’s authors chose a star called S2, which is 15 times the Sun’s mass and has an orbital period of almost exactly 16 Earth years.

The study’s authors chose a star called S2, which is 15 times the Sun’s mass and has an orbital period of almost exactly 16 Earth years. Photo: Universe Today
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These features are important because of their prominence and also because of the ease of calculation of the so-called Schelling point. Schelling’s point comes from game theory, namely how two people can talk about something without actually communicating it in the first place.

For example, someone wants to meet their friend, but doesn’t want to tell him when and where he wants to meet. The other person is also interested in meeting, but is equally interested in not sharing when and where.

The Schelling point is thinking through common ground to try to determine a meeting place without saying it directly. For example, two people roughly know that they are choosing one of the most famous days of the year, and that could be New Year’s Eve, which is December 31st.

As for the meeting place, most likely two people will choose the most famous city and the most famous place in it. This would be Schelling’s point for two earthlings, but the same judgments can be applied to communication with alien life forms.

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The star S2 and the period of its orbital movement is what we have in common with any alien life in the Milky Way, because most likely the aliens also have an idea about the object and its properties.

Scientists believe that by using the characteristics of this particular star, astronomers could begin to look for signals in a specific region of space that use the period of the star’s motion as a basis for communication.

The idea, scientists say, is to find some common experience that can be used as a basis to try to communicate with aliens without first communicating.

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Jake Carter

Jake Carter is a researcher and a prolific writer who has been fascinated by science and the unexplained since childhood. He is always eager to share his findings and insights with the readers of, a website he created in 2013.