PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY
An astronomer at work inside the Solar Vacuum Telescope at Kitt Peak National Observatory, Arizona. The telescope has a 75-foot (22.9-metre) high tower. Two flat mirrors at the top of the tower reflect the Sun's image down through an evacuated tube to the 24-inch (0.6m) diameter image-forming mirror at the foot of the tower. The use of a vacuum tube prevents the Sun's image from being distorted by hot air within the tower. The telescope has been in operation since 1973.
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