Nasa's Unexplained Files

2:00 PM to 3:00 PM
Friday 4 April
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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 History at 2:00 PM, Friday 4 April. (Subtitles.)
Topics
Education ➝ Science ➝ Factual Topics
Unexplained ➝ Mysteries