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Hide from extraterrestrial civilizations

11.05.2017

Since Stephen Hawking and other scientists raised the question of why we should declare our existence to other civilizations that may not be friendly at all, the debate on this topic has not subsided. A recent article by Columbia University Associate Professor of Astronomy, David Kipping, called "How to Create an Invisibility Cloak to Hide the Earth from Extraterrestrial Civilizations?"

In it, Kipping says that if extraterrestrial civilizations, which scientists warn about, really significantly overtook us in development, then it costs them nothing, firstly, to hide from our eyes using methods that are still unknown to us, and secondly, create the illusion of visibility when it suits them. As an example, the scientist cites the so-called transit method for detecting exoplanets. It is based on observations of the passage of a planet against the background of a star, which leads to a regular, slight dimming of the star's brightness. Measurement of the depth and duration of the transit makes it possible to determine the radius of the exopanet, the semi-major axis of its orbit, and its eccentricity, provided that the orbital period of such a planet is known.

From the point of view of a scientist, such a decrease in the brilliance of a star in the eyes, or rather, in the observer's telescopes, can be deliberately caused with the help of laser devices already at our disposal in order to mislead the observer. Or vice versa: lasers can be used to compensate for the dimming and not give themselves away. This would require 30 megawatts of electricity, according to Kipping's calculations, using detection technology like that used by the Kepler space observatory, which sees exoplanets in the same light. And with an increase in power by 10 times, you can achieve "multi-colored" invisibility. For this, modern terrestrial (rather than alien) lasers come in handy, using supercontinuum generation, in which laser light is converted to light with a very wide spectrum (i.e., with low temporal coherence), while spatial coherence usually remains high.

Since the author argues that if with the help of our technologies it is possible to manipulate the visibility or invisibility in the Universe, then it is difficult to imagine what could be in the arsenal of more advanced civilizations. Therefore, the question of whether the earthlings need an invisibility cloak remains rhetorical.

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