Nasa's Unexplained Files

12:00 AM to 1:00 AM

Monday 11 November

Earth's Secret Aliens

Season 3 Episode 20 of 24

Geologists begin to ask questions about 'alien' deposits found on the Earth's surface - and the answer could shed light on the cause of history's greatest extinction event

Nasa's Unexplained Files airs on Quest at 12:00 AM, Monday 11 November. (Subtitles.)

Learn more about Nasa's Unexplained Files and other education/science/factual topics on our factual page

Topics

Education ➝ Science ➝ Factual Topics

Unexplained ➝ Mysteries