What are the Marfa Mystery Lights?

The Marfa Mystery Lights are strange luminous orbs that seem to dance around at dusk in the air close to Highway 90 in Marfa. Researchers believe the lights might be an optical illusion caused by heat haze or car headlights. Less scientifically minded viewers think there might be a paranormal explanation. No one has proved anything either way, though, so go see for yourself!