Horizon: Supermassive Black Holes
"Horizon" examines the recent discovery of supermassive black holes, which spawn galaxies even as they threaten to destroy everything in their path.
| Actor | Role |
|---|---|
 John ShrapnelNarrator | Narrator |
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"Horizon" examines the recent discovery of supermassive black holes, which spawn galaxies even as they threaten to destroy everything in their path.
| Actor | Role |
|---|---|
| John ShrapnelNarrator | Narrator |