billsoxs writes "The Marfa lights are ghostly lights that have been observed for years around Marfa TX (near Big Bend). They have been the subject of curiosity , a source of tourism and scientifically studied a number of times. Now a group of physics students from the University of Texas at Dallas (UTD) have use small lasers and traffic sensors to show that these lights are most likely headlights from cars on a distant highway. The publication is in the Society of Physics Students website. The PDF of the article is here. (Unfortunately the related video is no longer available on the web but more stuff is here.)"