This Two-Acre Telescope Powers Science's Search for Dark Energy [Monster Machines]

For lack of a better word, the Robert C. Byrd Green Bank Telescope (GBT) is ginorgantic. (That's the evolved form of ginormous). At 17 million pounds, it is both the world's largest, most technologically-advanced single-dish radio telescope—and the single biggest land-based movable structure on the planet. More »

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