A giant skull-like head was captured in a photograph by an astronaut aboard the International Space Station. Getting into the spirit of the spooky season, NASA released the photo on Halloween. The ghostly "face" seems to hauntingly stare back at the camera from space.
Rather than an exotic moon or planet, this curious formation is located right here on Earth, inside an enormous volcanic crater in the Saharan Desert in the country of Chad.
NASA explains that the ghostly face was formed by shadows cast by the rim of the caldera, with the "eyes" and "nose" actually being cinder cones, conical hills created during volcanic events. The "mouth" is a mineral crust made of a salt called natron.