Heavens on Earth: 3 Planetariums on the Cutting Edge

Planetariums may date back to the far reaches of recorded time, but the first widely known example -- an ancient cast-metal globe made by Archimedes to predict the movements of the planets -- now seems to have little in common with the technological marvels that have become widespread today. Rather than focusing on planets and predictions, today's planetariums are experiential wonders.

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