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© NASA/JPL/Space Science Institute
| Enigmas of the universe Four hundred years ago, Galileo looked up at the dark spots on the face of the Moon and identified them as seas. He was wrong. Today, we send missions to the Moon in search of water. Yet in spite of such extraordinary technological advances, much about the universe remains unknown. Experts believe we know only 5% of all matter. Surprises are in store, they predict.
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