Nasa's Unexplained Files
Top Secret Terror
Season 2 Episode 2 of 8
Images of Mercury reveal spider-like formations on its surface which may be an odd geological formation or something more ominous
Nasa's Unexplained Files airs on Discovery Science +1 at 8:00 AM, Sunday 24 November. (Subtitles.)
Topics
Education ➝ Science ➝ Factual Topics
Unexplained ➝ Mysteries