The singular possessive form for the noun observatory is observatory's.
Example: The observatory's admission is half price for children.
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The name of the observatory in Chicago is the Adler Planetarium.
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No, Mount Wilson Observatory and Griffith Observatory are two distinct observatories in Los Angeles. Mount Wilson Observatory is located in the San Gabriel Mountains and is known for housing the Hooker Telescope, while Griffith Observatory is located in Griffith Park and is a popular public observatory with educational exhibits and planetarium shows.
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