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Series SeasonSeason 5 episodes2018
Space's Deepest Secrets
Season 5
No season overview available.
Episodes
Each episode has its own detail page.
Episode 142 min2018-10-15
Dark Origins of the Moon
New discoveries reveal that everything known about the moon could be wrong; investigators race to understand the mysteries of its dark and violent past.
Episode 242 min2018-10-22
Mystery of the Alien Megastructure
A mysterious star hundreds of light years away might hold the hard evidence of extraterrestrial life, as experts speculate that its bizarre behavior points to proof of a massive alien-made megastructure.
Episode 342 min2018-10-29
Journey to Saturn's Rings
New discoveries change everything known about Saturn's rings, revealing that they're newer and more mysterious than ever imagined, and that some day soon, they might disappear forever.