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http://www.youtube.com/channel/UC9MAhZQQd9egwWCxrwSIsJQThe Universe: Constellations & The 13th Zodiac Sign (S2, E10) | Full Episode | History -

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A constellation is a group of stars that are connected together to form a figure or picture. These star pictures help organize the night sky and provide a useful tool for astronomers even today, in Season 2, Episode 10, "Constellations." #TheUniverse
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