30.3085°N, 104.0217°W.
The Marfa Lights, also called the Marfa ghost lights, are intermittent point-source luminous phenomena reported on the Mitchell Flat east of the town of Marfa, Presidio County, in the Trans-Pecos region of West Texas, at an elevation of roughly 1,400 metres on a high desert basin floor. The first recorded observation is conventionally attributed to the young rancher Robert Reed Ellison in 1883, who reported the lights to local newspapers and was initially convinced they were Apache campfires. The lights typically appear at night near the horizon at distances of several kilometres, hover, split, recombine, change colour, and fade over minutes; a permanent state-built viewing platform on US Highway 90 just outside Marfa receives heavy year-round tourist traffic. A 2004 study by physics undergraduates from the University of Texas at Dallas, using simultaneous triangulation cameras, attributed many sightings to vehicle headlights on US Highway 67 some 30 kilometres distant, refracted through layered cool-over-warm desert air in classic mirage conditions. Locals continue to report lights well outside that explanatory geometry, including before the highway was paved.
The Marfa Lights remain officially unexplained, sit inside a designated International Dark Sky region, and have never produced an artefact.