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Thermal imaging displays differences in infrared radiation emitted by objects and their surroundings, translating them into an image. The appearance depends on the sensor, settings, and shooting conditions; therefore, a bright or dark spot alone doesn't identify what's seen in the image.
In reports of unidentified anomalous phenomena (UAP), military thermal cameras have documented spots and areas that moved, disappeared, or blurred into the background, sometimes with the sensor tracking them or changing zoom and contrast. On this page, you'll find videos and descriptions of such cases. They show what was recorded, but in many of them, the object's identity remains unknown.
Thermal imaging creates an image based on infrared radiation, which is related to the heat emitted by objects and their surroundings. It displays heat differences, not colors as they appear to the eye.
A thermal camera can document an area that appears different from its surroundings, but the image alone doesn't necessarily identify its source. In the reports on this page, many of the anomalies remain unidentified.
Regular photography records visible light, while thermal imaging records infrared radiation. Therefore, a thermal camera can display heat differences even in lighting conditions where it's difficult to see with the naked eye.
The contrast between the spot and the background may change, and zoom, movement, or changes in sensor settings can also affect its appearance. Disappearing from the image doesn't prove the object vanished in reality.
Not always. Without information on camera movement, scale, distance, and shooting conditions, it's difficult to infer the object's speed or distance from the video alone.