KEN BIGGS / SCIENCE PHOTO LIBRARY KEN BIGGS / SCIENCE PHOTO LIBRARY
An antenna of the Very Large Array (VLA) radio telescope. VLA, 27 of which are operating at any given time. This allows for each dish to be maintained in turn without affecting the array. Each dish is 25m in diameter and weighs 235 tonnes. The 27 operating dishes are arranged in an equiangular 'Y' formation, each arm of which is about 20km long. This allows them to simulate a single dish 26km in diameter. The VLA is near Socorro, New Mexico USA.
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