When I was eighteen, I stood with several others beneath a circular object that glowed in alternating colours. It hung perhaps one to two hundred metres above our heads, not far from an American military base. We all saw it, none of us could explain it, and we talked about it for a long time afterwards.

Many years later it happened again, and again I was not alone. Two very bright objects, several kilometres away, drifting slowly southward. Then a sudden, harsh, shimmering flare of light, and both were gone. Not faded, not obscured by cloud, not slowly diminished. Gone.

I am not writing this down because I believe I saw visitors. I am writing it down because I still cannot say what it was, and because that has nothing to do with my memory or with the attentiveness of the people standing next to me. It has to do with one piece of information that all of us lacked, and that nobody could have supplied.

We did not know how far away it was.

The number missing from every image

Without distance, an observation of the sky contains no size, no speed, no acceleration. It contains an angle and a brightness, and nothing else. A point of light that appears to cross half the sky in a second may be three hundred metres away and slow, or thirty kilometres away and very fast. Both cases look identical. Only distance decides whether you are looking at something ordinary or something inexplicable.

My "one to two hundred metres" was therefore not a measurement but a feeling. Beyond a few metres the human eye has no rangefinder, and with lights in a dark sky, without reference points, without a known object size, an estimate loses all foundation. This is not a weakness of particular observers. It is how vision is built.

And the witnesses? They confirm that the event took place. They do not confirm what was there. People standing side by side share a line of sight, a perspective, and the same missing number. Determining a distance requires two positions several kilometres apart, with synchronised clocks and known orientation. Only then do two lines of sight intersect at a point, and only then does an object exist in three-dimensional space rather than on a retina.

The abrupt, glaring extinction of those two lights, incidentally, has a familiar signature. A specular reflection running out of geometry, or an object entering the Earth's shadow, ends not gradually but instantly. Perhaps that is what it was. Perhaps not. Nobody can decide, and that inability is the actual subject here.

Five billion cameras and no measurement

One would assume the problem had solved itself by now. Over two decades the number of cameras under the open sky has risen by orders of magnitude. Almost every person carries one. And yet the images have not become sharper. They have become more numerous.

That is not a coincidence but a confirmation. Images without distance do not accumulate into knowledge. Ten thousand recordings without range are still zero measurements, because none of them contains the quantity you would need in order to decide what the thing means.

The strongest evidence for this comes from the people with the most to gain if it were otherwise. The Galileo Project at Harvard University built an observatory that does not look into the distance but watches the entire sky overhead, in infrared, optical, radio and audio bands. In five months of operation it reconstructed roughly 500,000 trajectories of airborne objects. An algorithm flagged about 16 per cent as outliers, and some 80,000 of those were examined by hand. In the end, 144 trajectories remained ambiguous. Not anomalous. Ambiguous. And the principal limitation of the entire analysis is stated plainly in the paper: the distances to the observed objects were unknown.

Since the project began, no peer-reviewed publication has identified an object as anomalous. The papers are about instruments and methods, not findings. To conclude from this that nothing is there goes too far. To conclude that something is there goes just as far. All that follows is that the instrument does not yet measure the thing that matters.

What was measured is sealed

Now the objection that deserves to be taken seriously, because it is the strongest one. There is footage from military aircraft, some of it covering extended periods, some of it involving several sensors at once.

The three best-known clips come from the US Navy and were officially released and authenticated by the Department of Defense in April 2020. They remain classified as unidentified. Their authenticity was never in dispute. What is in dispute is their legibility, and the difference matters. A targeting pod on a fighter aircraft is built to put weapons on targets, not to characterise unknown objects. What exists publicly are compressed excerpts without full telemetry.

One of those videos shows what happens when someone does the arithmetic. In the clip that appears to show an object racing just above the ocean surface, the aircraft altitude, sensor angle and range were displayed on screen, which is enough for trigonometry. The director of the responsible Pentagon office testified before Congress in November 2024 that his office assesses with high confidence an altitude of around 13,000 feet, and that the spectacular speed is a parallax effect produced by the aircraft's own motion. The object that seemed to break physics turned out to be slow and high. The mystery lasted exactly as long as nobody calculated the distance.

In a second clip, where an object appears to rotate, the leading competing explanation is that the rotation belongs to the glare inside a gimbal-mounted optical system rather than to the object. That has not been officially settled.

And then the case that carries the most weight, because radar was involved. Unlike any camera, radar delivers a distance. During the encounter off the Californian coast in November 2004, a ship-based phased-array radar, an airborne early-warning aircraft, a fighter's targeting pod and several pairs of eyes converged on the same event. Four channels. The missing number must have existed.

The case is nevertheless unresolved to this day. Not because no measurement was taken, but because the recordings were never publicly released, because no official case resolution for the incident exists, and because the chain of custody of the original data has never been established in public. Accounts circulate about data drives being collected, which one of the pilots involved disputes. What the public is left with is the assertion of a measurement rather than the measurement.

That leaves a finding uncomfortable for both camps. Nothing in the publicly available record has been established as anomalous. Nothing has been positively identified either. The widely quoted estimates of accelerations far beyond known engineering rest on assumed distances and assumed object sizes, which places them on the same gap as the other side, merely with the sign reversed.

What was measured is sealed. What is open was never measured.

Who moves into the gap

A gap of this kind does not stay empty. Two forces reliably move in.

The first is entertainment. A single author sold roughly seventy million books on the claim that extraterrestrials shaped early human history, and founded a television format that has now run for a decade and a half. In a recurring American survey, 41 per cent of respondents agreed that aliens visited Earth in antiquity, up from 27 per cent a few years earlier. The answer is wrong, and its architecture is demeaning, because it strips the great monuments of non-European cultures from the people who built them. The need underneath it is nonetheless real.

The second force is state performance. In the United States, the release of files on unidentified phenomena was ordered by presidential post on a social platform. Within months this produced a disclosure apparatus publishing material in tranches, with more than a billion views and a scientific advisory council whose existence no agency has officially confirmed and which operates without a budget. A former deputy assistant secretary of defense summarised the process in the observation that data alone is not disclosure, and that raw files without context may confuse more than they clarify.

How sober the underlying demand actually is can be seen at a small private reporting office in Hesse, Germany, which has been explaining sky phenomena for decades. It currently records the highest volume of reports in its history, several a day, driven by the American releases. Its director says that nearly all callers simply want to know what they saw, and arrive with no expectation of a spacecraft. The demand is reasonable. The supply is not.

The sky we already measure

And here the matter turns from a mystery into an omission.

For meteors, we built precisely the machine that is missing here. A European camera network operates around ninety stations with a target spacing of one hundred to one hundred and fifty kilometres, a density already achieved in Germany. Almost every recorded fireball is captured by several stations at once, in some cases by thirty. From the intersecting lines of sight fall out trajectory, velocity and origin orbit, for roughly five thousand meteors a year. The work is carried by amateur astronomers, observatories and a non-profit association, with freely available analysis software. The older European fireball network, operated among others by the German Aerospace Center and a Czech observatory, has worked on the same principle since the nineteen-sixties.

The same sky. The same nights. The same physics. For falling rock, hobby astronomers compute three-dimensional trajectories and reconstruct which part of the solar system the fragment came from. For the phenomenon that occupies parliaments, presidents and a billion clicks, we collect statements.

The technology, then, is not the obstacle. Neither is the cost. What is missing is responsibility for the task.

What Europe would have to build

Not an agency for extraterrestrials. A measurement layer for its own airspace.

In practice that means calibrated multi-station camera networks with synchronised timing, so that a distance becomes computable for any event in the sky. It means connecting to the existing meteor networks rather than building from scratch, because the infrastructure, the sites and the analysis chain already exist. It means open raw data, so that results can be checked instead of believed. It means a published resolution rate as a performance measure, so that it becomes visible whether the body is doing its job. And it means a named authority that people can actually turn to.

The occasion for this is not the question of visitors. The occasion has been on every security agenda for years. Unmanned aircraft appear over European airports, barracks and industrial sites, and in the United States a single reporting period recorded fifty reports of such craft near nuclear facilities, weapons locations and launch sites, deliberately kept separate from the UAP category. Whoever can determine the size, altitude and speed of an object over restricted airspace is solving a security problem first. The other question answers itself along the way.

What matters is that this layer must be civilian and open. Not because military data is worthless, but because a classified holding cannot structurally settle a public question. A track file nobody is permitted to examine persuades nobody who is not already persuaded. This is not a failure of secrecy but a confusion of categories. It is why the American disclosure programme has been producing tranches rather than clarity, and why the next tranche will not change that either.

Testimony does not scale

What I saw at eighteen remains unexplained, and it will stay that way. I can live with that. What occupies me is that on the same night, in all likelihood, hundreds of other people saw something, that millions have joined them since, and that not one reliable datum has come out of any of it.

That is the actual message, and it reaches well beyond the sky. Experience can be multiplied without limit and still produce no knowledge. Testimony does not scale. A civilisation that increases its observers a thousandfold without building the capacity to measure will meet the same wall at every question that needs to be settled quickly and beyond dispute: much excitement, many images, no decision. And into the space that clarity leaves empty moves first the story, and then the performance.

Which body in Europe should be able to answer when ten thousand people see the same light on the same night, and why is there none?

Website: https://planet-futures.org