Ata is just six inches tall, with a conical-shaped head and unusually hard bones for her size. Some have claimed that she’s an alien. But a new study published today in the journal Genome Research not only continues to disprove the alien theory, but also reveals a scientific explanation for her allegedly extraterrestrial appearance.

The debate started in 2003 when the naturally mummified remains of Ata were discovered near a ghost town in Chile’s Atacama Desert. A Spanish businessman, Ramón Navia-Osorio, purchased her mummy and in 2012 allowed a doctor named Steven Greer to use x-ray and computed tomography (CT) imaging to analyze her skeleton.

Greer is the founder of The Disclosure Project, which is “working to fully disclose the