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Large outdoor spaces are generally necessary, as is some means for highlighting objects that might otherwise not be noticed from a distance
visibility
The distance between the Earth and the Sun is almost 12,000 times the diameter of the Earth
enormous ratio
Solar System models, especially mechanical models, called ______, that illustrate the relative positions and motions of the planets and moons in the Solar System have been built for centuries
orreries
The ______ had placed bronze models of the planets in major public buildings, all on similar stands with interpretive labels
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The model of ______ was located in the cavernous South Station waiting area
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