Min Min Lights
Later explainedSummary
In the Australian outback, a light appears on the horizon at night, and it follows you. It keeps pace with your vehicle. It hovers. It vanishes when you approach it and reappears behind you.
The explanation, established experimentally in 2003, is stranger than anything anybody had proposed.
It is a car. Or a campfire, or a homestead light. And it may be a hundred kilometres away, and it may be below the horizon, and you are seeing it because on a cold desert night the atmosphere itself can bend light around the curve of the Earth and deliver it to your eyes.
What is documented
The reports. Luminous objects seen at night in the outback, particularly in western Queensland. They appear as a glowing point or disc on or near the horizon. They are described as following travellers, keeping station with a moving vehicle, hovering, receding when approached, and disappearing abruptly.
They are strongly associated with Boulia, in the Channel Country, and with a place called the Min Min Hotel, which is where the name comes from.
They are seen on cold, clear, still nights. This is a consistent feature of the reports and it is the clue that solves the case.
The experiment. Jack Pettigrew, a neuroscientist at the University of Queensland, published the explanation in Clinical and Experimental Optometry in 2003, and he did not merely propose it. He demonstrated it.
Leading explanations
Superior mirage in an atmospheric duct. Established, and reproduced experimentally.
Here is the mechanism, and it is worth setting out properly because it is genuinely remarkable.
On a clear desert night, the ground radiates its heat away to space very rapidly. The air immediately above it cools, and cools faster than the air higher up. The result is a temperature inversion: a layer of cold, dense air lying beneath warmer, less dense air.
Light travelling horizontally through such a layer is bent. Its path curves downward, following the density gradient. If the gradient is right, the light curves at approximately the same rate as the surface of the Earth.
The atmosphere becomes a waveguide. Light entering it is trapped, and carried, and delivered over the horizon.
How far. Very far. Under favourable conditions, tens of kilometres, and Pettigrew argues for distances that can run into the hundreds. Sources that are geometrically far below the horizon, entirely invisible in any ordinary sense, are lifted into view.
Why it follows you. This is the part that produced the folklore, and it is the part the mechanism explains best.
You are not looking at a light. You are looking at an image of a light, formed by the duct you are sitting inside. Move, and you carry the duct with you, and the image moves with you.
It appears to keep pace with your vehicle because it is not a thing at a distance. It is an artefact of the air you are travelling through.
Why it vanishes when you approach. Because you leave the conditions that form the image, or the geometry changes and the duct no longer delivers it to you.
Pettigrew's demonstration. He arranged for a vehicle with its headlights on to be positioned well beyond a ridge, geometrically below the horizon from the observers' point of view, on a night with the right thermal conditions.
Observers saw a Min Min light.
He then had the vehicle drive, and the light behaved as Min Min lights behave.
What the popular version gets wrong
"It cannot be car headlights, because there is no road there." There does not need to be a road anywhere near you. The source can be beyond the horizon. It can be beyond several horizons. That is the entire point and it is what nobody guessed, because it does not seem physically possible until you understand the duct.
"The lights were reported before there were cars." They were, and the mechanism does not require cars. It requires a light source. Campfires, station lamps, and the fires of Aboriginal people crossing the country will all serve, and all of them predate the automobile by a considerable margin.
"It follows you, so it must be intelligent, or supernatural." It follows you because it is a mirage carried in the air around you, and the air around you goes where you go.
"Nobody has explained them." Somebody explained them, and then went out into the desert with a car and a set of observers and did it on purpose.
Current status
Later explained. The mechanism is understood, is standard atmospheric optics, and has been demonstrated experimentally under field conditions.
The registry keeps this record beside AR-0017, and the pair is instructive. Marfa and the Min Min are the same phenomenon: a distant, ordinary light source, delivered to the observer by an atmosphere doing something surprising, and mistaken for an object because it does not behave the way an object at that apparent distance should.
In both cases the answer required somebody to look at the light and at where it was coming from, at the same time. And in both cases nobody did that for over a century.
Sources
- Pettigrew, J. D. (2003). "The Min Min light and the Fata Morgana: an optical account of a mysterious Australian phenomenon." Clinical and Experimental Optometry 86(2), 109-120. Including the field demonstration.
- Standard literature on atmospheric ducting, temperature inversions, and superior mirage.
- Historical reports of Min Min lights from western Queensland.
Last reviewed: July 2026. Records are provisional. Where the evidence changes, the entry changes. Found an error? Tell us.