noun
EXAMPLES FROM CORPUS
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A mobile, inflatable planetarium costing £9,000 will now be used in the region by up to 10,000 pupils each year.
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But take them to a planetarium or a science show and watch their little eyes light up.
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I shall never never never forget your back yard, planetarium and ham radio shed.
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It was only incidentally a timepiece. primarily it was a mechanical representation of the universe, a kind of planetarium .
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Or sit in a tiny planetarium for an introduction to the rudiments of stellar navigation.