While the planet debates climate and nuclear weapons, a handful of scientists with radio transmitters have already placed a bet in a game with far higher stakes—they've sent Earth's coordinates into space with no room for error.
November 16, 1974 — a radio telescope in Puerto Rico shot a pixelated picture into space: a schematic stick figure with arms and legs, the double helix of DNA, outlines of the Solar System. Three minutes of transmission, 21,000 light-years to the recipient — globular cluster M13 in the constellation Hercules. Scientists Frank Drake and Carl Sagan called it "a demonstration of technological capabilities." Critics — "cosmic graffiti on the wall of the Universe."
The message is still flying, outpacing the light of past eras. By the time it arrives, a thousand generations will have changed on Earth. But there's no recall protocol — radio waves don't brake and don't self-destruct. If someone's out there, they'll receive instructions: here's our chemistry, here's our location relative to pulsars, here's the frequency on which we're listening.
1999, Yevpatoria in Crimea: a new series of transmissions. 2008 — NASA broadcasts the Beatles' "Across the Universe" toward Polaris. John Lennon sang about infinity, not knowing his voice would become a beacon for those who might hear. Each signal is a bottle thrown into an ocean where the currents are unknown and the shores might prove hostile.
Paul Davies — not a conspiracy theorist, not a panic-monger. Australian cosmologist, Templeton Prize laureate, a man whose books on the origin of the Universe have been translated into twenty languages. When he took over SETI: Post-Detection Science and Technology Taskgroup at the International Academy of Astronautics, colleagues expected signal decoding protocols. Davies started differently: "And if they answer us — who decides what to say back?"
The question hung in the air like smoke after a gunshot. Until that moment, SETI had been engaged in passive listening — giant antennas catching the noise of space, hoping to discern a pattern of intelligent origin. No one argued about the right to listen. But Active SETI — active transmission of messages — that's no longer science, that's politics. That's the right to speak on behalf of the species without asking the species for permission.
Davies formulated the problem bluntly: any organization with a powerful transmitter can send a signal that will reach the stars before humanity works out a consensus on the advisability of contact. Radio waves recognize no borders or jurisdictions. One pulse — and Earth forever ceases to be invisible.
Critics from his own camp objected: we're already glowing. Television broadcasts, military radars, GPS signals — all of this has been leaking into space for decades. But Davies pointed out the difference: background radiation dissolves into cosmic noise at a distance of a few light-years. A directed beam from a radio telescope — that's a searchlight that cuts through darkness for trillions of kilometers. It's the difference between accidental light in a window and a signal flare with coordinates.
The American Association for the Advancement of Science conference turned into a battlefield. Seth Shostak, senior astronomer at the SETI Institute, and Douglas Vakoch, director of interstellar messaging, took the podium to defend Active SETI. Their argument: silence is also a choice, and possibly a fatal one. If advanced civilizations exist but everyone's hiding in fear, the galaxy will remain a graveyard where everyone's afraid to light the first fire.
By that point, Vakoch had already been curating the Earth Speaks project for six years — a crowdsourcing platform for collecting messages from people around the world. Over 70 countries sent texts, drawings, sounds. The idea was democratic: let the message be shaped by the people, not a narrow circle of scientists. But democracy stumbled over the technical threshold — the final decision to transmit was still made by a team with access to the transmitter.
At the same conference, paleobiologist Simon Conway Morris from Cambridge, a specialist in the evolution of complex organisms, spoke. His thesis was grim: if evolution is convergent — and the fossil evidence says exactly that — then intelligence anywhere in the Universe will pass through the same selection filters. And that means: competition, territoriality, aggression. "We project our utopian fantasies onto aliens," Morris said. "But biology knows no altruistic civilizations."
Even earlier, in 2010, Stephen Hawking in a Discovery documentary series compared potential contact to Columbus's arrival in America. For the natives, the encounter ended in catastrophe — not because the Spanish were evil, but because the technological gap made the outcome predictable. Hawking warned: a civilization capable of crossing interstellar distances will treat us the way we treat an anthill in the path of a bulldozer.
The debates produced no winner. Scientists dispersed without agreeing on red lines.
That same summer, a group of researchers and technology leaders prepared an open letter demanding a moratorium on unauthorized interstellar transmissions. Among the signatories — Elon Musk, by then already founder of SpaceX and Tesla, a man whose business is built on space colonization. His signature was unexpected: Musk isn't one to call for caution. But even he considered Active SETI risks serious enough to demand international regulation.
The petition demanded something simple: before sending signals on behalf of the planet, create a global advisory body to assess risks and develop a protocol. Not a ban, but a procedure. The idea was reasonable — if humanity agreed on regulating nuclear weapons and biological experiments, why not extend consensus to interstellar communication?
But the petition remained a petition. The UN didn't include the question on its agenda. The International Astronomical Union expressed general concern, but no legally binding document appeared. The reason is simple: space law regulates the actions of states, and most radio telescopes belong to universities and private organizations. The Outer Space Treaty of 1967 prohibits militarization of orbit but doesn't mention radio transmissions. A loophole the size of a galaxy.
By that point, Vakoch had already left the SETI Institute and founded his own organization — METI International (Messaging Extraterrestrial Intelligence). If SETI listens, METI speaks. The name was a challenge: we're not asking permission, we're acting.
November 16-18, 2017 — a radio telescope in Tromsø, Norway sent a series of pulses to star GJ 273 (Luyten's Star), located 12.4 light-years from Earth. Target point — exoplanet GJ 273b, potentially in the habitable zone. Transmission content: "Sónar Calling GJ273b" — musical patterns created by participants of Barcelona's Sónar electronic music festival. The idea was to teach the recipient mathematics through rhythm and frequencies.
METI International didn't request government approval. Didn't hold a referendum. Didn't convene a risk assessment commission. Vakoch explained the decision simply: "We've waited half a century for a signal and heard nothing. Perhaps all civilizations are silent, waiting for someone else to take the first step. We decided to take it."
The signal went out. In 25 years — if there's a receiver on GJ 273b — they'll get it. Another 25 and we'll know if there's an answer. But it can't be recalled now. Radio waves know no pause.
Critics descended immediately. Dan Werthimer, chief scientist at Berkeley SETI, called METI's actions "irresponsible and immoral." Astronomer James Benford pointed out the main thing: "We're running an experiment where there's no control group. If something goes wrong, we can't cancel the result."
But legally, METI violated no law. The radio frequency was registered. The transmitter — legal. The right to speak on behalf of humanity turned out to be not a right, but technical access.
2026. Nine years have passed since "Sónar Calling" was sent, and the signal has covered a third of the way to GJ 273b. No new international agreements have appeared. METI is planning the next transmission — this time to the TRAPPIST-1 system, where seven exoplanets orbit, three of which are potentially habitable. 39 light-years — travel time 78 years round trip. If there's intelligence there, an answer might come by the end of the 21st century.
The paradox is that Active SETI opponents can't stop the process physically. Transmitters are distributed across the planet, managed by independent structures. Even if one center is shut down, others will continue. In 2022, China commissioned FAST — the world's largest radio telescope with a diameter of 500 meters. Officially it conducts observations. But technically it's capable of transmitting signals with power tens of times greater than Arecibo's capabilities.
METI supporters offer a counter-argument: if a hostile civilization exists and is hunting for prey, our planet is already visible. Earth's atmospheric spectral signature — oxygen, methane, water vapor — can be read by telescopes from hundreds of light-years away. If "predators" exist, they already know where to look. Silence won't hide us — it will only prolong loneliness.
But physicist Mark Buchanan from the Santa Fe Institute objects: spectral analysis requires powerful instruments and long observation. A directed radio signal — that's an address with backlighting. It's the difference between a house in the forest and a house with a neon sign on the highway.
Humanity continues a game where the stake is survival and the rules aren't yet written. Signals keep going out, one after another, like messages in bottles thrown into an ocean whose depth is immeasurable. Perhaps no one will answer. Perhaps the answer will come in centuries, when those who sent the message have long vanished. Or perhaps — and this is the most alarming scenario — the answer will come faster than we're ready to hear it, and turn out to be not what the senders from Tromsø and Arecibo were counting on.