A recent paper published by Dr. Duncan H. Forgan of the University of St. Andrews proposes that alien super civilizations in our galaxy could communicate with each other by creating “artificial transits” in their respective stars.

Titled Exoplanet Transits as the Foundation of an Interstellar Communications Network, the paper begins by mentioning two basic problems associated with interstellar communication: time and energy consumption.

When we speak of radio transmissions, for example, the amount of energy required to transmit a coherent message over long distances is prohibitive. On the other hand, optical signals (i.e. lasers) require less energy, however, for the receiver to detect them would require ridiculously precise coordination.

Therefore, no method currently available to man would be reliable to establish an interstellar communication system with another civilization.

Forgan argues that a method where transits in front of stars are used as a basis for intergalactic communication would solve both problems. This is actually something quite logical considering that today transits are the most popular and reliable way astronomers detect distant exoplanets in the universe.

By monitoring a star for periods of diminished brightness, caused by a planet or object passing between the observer and the star, astrophysicists are able to determine if a star hosts a planetary system. The method is also handy for determining the presence or composition of atmospheres around exoplanets.

However, Forgan argues that this method could also be very useful for signaling other alien civilizations.

Professor Forgan argues how An ETI ’A’ can interact with ETI ’B’– if ETI B is observing transiting planets in A’s star system. This can be achieved by either developing structures to create artificial transits observable by B, or by sending out signals at B during transit, at significantly lower energy consumption than typical electromagnetic communication schemes. This can provide a network of interconnected civilizations, establishing contact via observing each other’s transits.

Forgan discusses the Galactic Habitable Zone—a region of the Milky Way where life is most likely to have developed—saying that different alien species may find the best way to communicate with one another by creating massive artificial megastructures that orbit and transit their host star.

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