Atmospheric phenomena Skeptic
Brian Dunning notes that the designated "View Park" for the lights, a roadside park on the south side of U.S. Route 90 about 9 miles (14 km) east of Marfa, is at the site of
Marfa Army Airfield, where tens of thousands of personnel were stationed between 1942 and 1947, training American and Allied pilots. This massive field was then used for years as a regional airport, with daily airline service. Since Marfa AAF and its satellite fields are each constantly patrolled by sentries, they consider it unlikely that any unusual phenomena would remain unobserved and unmentioned. According to Dunning, the likeliest explanation is that the lights are a sort of
mirage caused by sharp temperature gradients between cold and warm layers of air. Marfa is at an elevation of 4,688 ft (1,429 m) above sea level, and differences of 40–50 °F (22–28 °C) between daily high and low temperatures are quite common.
Car lights In May 2004 a group from the
Society of Physics Students at the
University of Texas at Dallas spent four days investigating and recording lights observed southwest of the view park using traffic volume-monitoring equipment, video cameras, binoculars, and chase cars. Their report made the following conclusions: •
U.S. Highway 67 is visible from the Marfa lights viewing location. • The frequency of lights southwest of the view park correlates with the frequency of vehicle traffic on U.S. 67. • The motion of the observed lights was in a straight line, corresponding to U.S. 67. • When the group parked a vehicle on U.S. 67 and flashed its headlights, this was visible at the view park and appeared to be a Marfa light. • A car passing the parked vehicle appeared as one Marfa light passing another at the view park. They came to the conclusion that all the lights observed over a four-night period southwest of the view park could be reliably attributed to automobile headlights traveling along U.S. 67 between Marfa and Presidio, Texas.
Spectroscopic analysis For 20 nights in May 2008, scientists from
Texas State University used
spectroscopy equipment to observe lights from the Marfa lights viewing station. They recorded a number of lights that "could have been mistaken for lights of unknown origin", but in each case the movements of the lights and the data from their equipment could be easily explained as automobile headlights or small fires. They concluded that due to the rarity of observation of "genuine" Marfa lights, those with odd behaviour not explainable as car lights, more research was necessary to determine their nature. ==In popular media==