A momentary gleam of starlight could reveal alien construction to the next generation of telescopes, a recent paper suggests. We’ve all experienced it: the glint of sunlight bouncing off a car ...

Binocular stereopsis is a powerful visual depth cue. To exploit it, the brain matches features from the two eyes' views and measures their interocular disparity. This works well for matte surfaces ...

Glints of light from specular reflection of the Sun are a technosignature of artificial satellites. If extraterrestrial intelligences have left artifacts in the solar system, these may include flat ...

Left: Schematic of the introduced prototype device for the measurement of specular surfaces, comprised of an unpolarized display and a polarization camera. Right: Measurement example: Object, camera ...

THE principle that a regularly stratified medium selectively reflects a monochromatic beam of radiation incident on it at the appropriate angle is well known and forms the basis for the X-ray analysis ...