COLIN CUTHBERT / SCIENCE PHOTO LIBRARY COLIN CUTHBERT / SCIENCE PHOTO LIBRARY
Eclipse viewing sunglasses. Woman and a man wearing glasses to protect their eyes while watching a total eclipse of the Sun. The lenses reduce the sunlight's intensity, making it safe to view the Sun for short periods. Solar ecl- ipses occur when the Moon passes between the Earth and the Sun, casting a shadow across the Earth. Viewing the Sun directly can cause blindness. Pho- tographed in Cornwall, England, on August 11 1999.
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