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BBC Four
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The Sky at Night
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Season 1991
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S1991E06
BBC Four
S1991E06: Guarding Their Secrets
The Sky at Night
· Season 1991
Aired 26 May 1991 at 9:00pm (UTC)
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Synopsis
Active galaxy BL Lacs
← E01: Mars - The Red Planet
E07: Saturn - The Ringed Planet →
← Back to Season 1991
