DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
View of the heliostat of the McMath solar telescope at the Kitt Peak National Observatory, Arizona. Largest its kind in the world, the telescope's tower stands 110 feet (33. The 60-inch (1.5m) image-forming heliostat - or tracking mirror - reflects the Sun's image down a diagonal 500- foot (152m) path inside the telescope. Some 300 feet (91. Sun's magnetic fields, motions and composition.
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