Season 8 Episodes7
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Ranked #5 of 7 in Season 8•−0.2 vs season avg
Astronomers make an extraordinary discovery when they uncover a cosmic mega-structure that's one billion light-years long, and now investigators race to decode the hidden forces that shape the most massive and mysterious structure known in the Universe.
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"Space's Great Wall" is episode 2 of Space's Deepest Secrets season 8. It scored 7.8/10 from 10 votes, ranking #5 of 7 episodes this season (season average 8.0). It aired on April 7, 2021.