Mysterious 'skull' discovered in Sahara's volcanic pit by astronaut
NASA has released a spooky image of a skull-shaped feature captured by an astronaut aboard the International Space Station. The eerie "skull" appears to glower from the heart of a volcanic pit in Chad's Sahara Desert. The feature is located on the floor of Trou au Natron, a volcanic caldera left behind by an ancient eruption. The skull's white color is due to natron, a naturally occurring salty mixture, while the eyes and nose holes are cinder cones. Trou au Natron was once a glacial lake and is one of the youngest volcanic features in the Tibesti Massif.