Season 8 Episodes7
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Ranked #6 of 7 in Season 8•−0.6 vs season avg
Astronomers unmask the truly destructive nature of the cosmos.
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"Mystery of the Dead Planets" is episode 1 of Space's Deepest Secrets season 8. It scored 7.4/10 from 10 votes, ranking #6 of 7 episodes this season (season average 8.0). It aired on March 31, 2021.