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This week we build on our naked eye observations from last week and take a look at the cyclical phenomena that we can see at work in the universe.
First Air Date : Jan 15, 2015
Last Air date : Dec 24, 2015
Episode : 46 Episode
Season : 1 Season
Runtime: 12:14 minutes
Studio: YouTube
Country:
Cast: Phil Plait
Crew: Phil Plait (Writer)
