Scientists Have Written the Rules for First Contact, and Step One Is Don’t Panic

A strange blip arrives on a radio telescope feed at three in the morning, narrow in frequency, drifting in the way you would expect of something far away and not of this Earth. The astronomer on shift does not reach for a phone. She does not post anything. The first thing she does, if she is following the rules now agreed by the world’s SETI researchers, is assume she is wrong, and start the long business of trying to prove it. That instinct, distrust before delight, has just been written into a formal document for the first time in over fifteen years.

On 1 June, the International Academy of Astronautics ratified a sweeping update to the protocols that would govern how scientists tell humanity it has company. The last version was set down in 2010, back when a tweet was a novelty and the phrase “deepfake” did not exist.

The document carries a dry title, the Declaration of Principles Concerning the Conduct of the Search for Extraterrestrial Intelligence, and it does something the public conversation about aliens almost never does: it slows everything down. Behind it sits Michael Garrett, who holds the Sir Bernard Lovell Chair of Astrophysics at the University of Manchester and chairs the IAA’s SETI committee. He led a revision that pulled in more than 350 researchers across several years. The trigger was not a signal. It was the world the signal would land in.

“The information environment we operate in today is vastly more complex than it was in 2010,” says Garrett. The worry is not the discovery itself but the few hours after it, when a half-confirmed rumour could outrun every careful caveat.

And the search has changed almost beyond recognition. When the first version of these principles was drawn up in 1989, SETI meant listening for a narrow-band radio whistle, the cosmic equivalent of a struck tuning fork. The new declaration takes a much wider view. Researchers now comb the whole electromagnetic spectrum: optical laser pulses, multi-messenger signals, and the faint infrared glow that a vast alien megastructure would leak as waste heat. A so-called technosignature, in the document’s language, might even be a physical artefact.

Check, Check Again, Then Ask Others to Check

At the core of all this is an old principle wearing new armour: extraordinary claims require extraordinary evidence. Under the revised rules, nothing goes public until a candidate has been authenticated by independent groups, on different instruments, working with different methods, the scientific equivalent of refusing to trust a single witness.

“We do not shout “alien” the moment we see a strange blip,” Garrett adds. “The scientific method demands we check, check again, and then ask others to check. Only when we have reached a consensus that a signal is credible do we bring it to the world.” It sounds almost too patient for the subject matter. That is rather the point.

What is genuinely new is the attention paid to the humans caught in the middle. The declaration acknowledges, in plain terms, that anyone connected to a credible detection could face harassment, doxxing, and a media crush of a kind few scientists are trained for. So it builds in protections. Researchers may decline to engage with the press, or with social media, without it counting against them professionally; their institutions are expected to shield them and to keep the science flowing in their stead. There is a clause for the awkward case too, the candidate that turns out to be a satellite or a microwave oven in the building next door. If a signal proves earthly after all, the rules say, admit it promptly and clearly. No quiet burials.

There are limits to what a declaration can actually do. It is, in the end, a voluntary code, not a law; a rogue claimant with a big enough following could ignore every line of it. The committee seems aware that its real power is reputational, a shared standard that lets the serious distinguish themselves from the noise.

Nobody Gets to Answer for the Species

Then comes the part that has gripped people since long before anyone could detect anything. If we hear from them, do we answer? On this the declaration is immovable, and deliberately so. No reply is to be sent on anyone’s private authority. A response, it states, is a decision belonging to all of humanity, to be taken only after international consultation, specifically through the United Nations. The discoverers get to make the first announcement, but nobody gets to speak back for the species. A confirmed detection would be reported in full to the public, the scientific community, and the UN Secretary General, backed by a peer-reviewed report and the raw data, archived in at least two repositories on different parts of the planet.

To keep watch over the longer aftermath, the committee will stand up a permanent Post-Detection Sub-Committee, stocked not only with astronomers but with ethicists, lawyers, social scientists and people who study how risk is communicated. A formal presentation to the wider scientific world is scheduled for the International Astronautical Congress in Türkiye later this year. The rules are written, lodged, and waiting for an event that may never arrive, or may arrive tomorrow.

What the declaration really is, underneath the careful procedure, is a rehearsal. Humanity practising its lines for the most consequential phone call it could ever receive, in the hope that if the moment comes, we manage to act less like a crowd and more like a civilisation.

Full document: IAA Declaration of Principles Concerning the Conduct of the Search for Extraterrestrial Intelligence (2026 Update)

Frequently Asked Questions

Why do SETI scientists need rules for announcing a discovery at all?

Because the gap between spotting an odd signal and confirming what it is can stretch for weeks or months, and that gap is exactly where rumours, hoaxes and panic can take hold. The 2026 protocols are designed to keep verified facts separate from viral speculation during that vulnerable window. The thinking is that how a discovery is handled may matter almost as much as the discovery itself.

If aliens were detected, would scientists tell the public right away?

Not immediately, and not until a candidate signal has been independently checked by more than one organization using different instruments. There is no obligation to announce anything while verification is still under way, though scientists are expected to correct rumours and to confirm if a signal turns out to be a false alarm. Only a result that survives that scrutiny gets brought to the world.

Is it true that no one is allowed to reply to an alien signal?

Under the declaration, yes, at least not on any individual or single nation’s authority. Sending a response is treated as a decision for all of humanity, to be made only after international consultation through the United Nations. The rules cover replying to a confirmed detection; the separate question of broadcasting messages into space first is left to other agreements entirely.

What counts as a sign of alien technology these days?

Far more than the classic narrow-band radio signal. Researchers now look for optical laser pulses, unusual infrared heat that could leak from enormous engineered structures, and other anomalies across the electromagnetic spectrum, collectively called technosignatures. Notably, the protocols deliberately exclude UFO or UAP sightings in Earth’s atmosphere from their scope.