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Such an intense signal, he reasoned, would be enough to stand out against the sun’s own infrared signal, in any “cursory survey by an extraterrestrial intelligence.” His aim was to produce an infrared signal that was at least 10 times greater than the sun’s natural variation of infrared emissions. He started with a simple conceptual design involving a large infrared laser and a telescope through which to further focus the laser’s intensity. “I wanted to see if I could take the kinds of telescopes and lasers that we’re building today, and make a detectable beacon out of them,” Clark says. I don’t know if intelligent creatures around the sun would be their first guess, but it would certainly attract further attention.” Standing up to the sunĬlark started looking into the possibility of a planetary beacon as part of a final project for 16.343 (Spacecraft, and Aircraft Sensors and Instrumentation), a course taught by Clark’s advisor, Associate Professor Kerri Cahoy. “The kinds of lasers and telescopes that are being built today can produce a detectable signal, so that an astronomer could take one look at our star and immediately see something unusual about its spectrum. “This would be a challenging project but not an impossible one,” Clark says. The notion of such an alien-attracting beacon may seem far-fetched, but Clark says the feat can be realized with a combination of technologies that exist now and that could be developed in the near term.

“If we were to successfully close a handshake and start to communicate, we could flash a message, at a data rate of about a few hundred bits per second, which would get there in just a few years,” says Clark, a graduate student in MIT’s Department of Aeronautics and Astronautics and author of the study. If the signal is spotted from either of these nearby systems, the study finds, the same megawatt laser could be used to send a brief message in the form of pulses similar to Morse code. Such a signal could be detectable by alien astronomers performing a cursory survey of our section of the Milky Way - especially if those astronomers live in nearby systems, such as around Proxima Centauri, the nearest star to Earth, or TRAPPIST-1, a star about 40 light-years away that hosts seven exoplanets, three of which are potentially habitable. The findings suggest that if a high-powered 1- to 2-megawatt laser were focused through a massive 30- to 45-meter telescope and aimed out into space, the combination would produce a beam of infrared radiation strong enough to stand out from the sun’s energy. The research, which author James Clark calls a “feasibility study,” appears today in The Astrophysical Journal.

If extraterrestrial intelligence exists somewhere in our galaxy, a new MIT study proposes that laser technology on Earth could, in principle, be fashioned into something of a planetary porch light - a beacon strong enough to attract attention from as far as 20,000 light years away. An MIT study proposes that laser technology on Earth could emit a beacon strong enough to attract attention from as far as 20,000 light years away.

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