DAVID NUNUK / SCIENCE PHOTO LIBRARY DAVID NUNUK / SCIENCE PHOTO LIBRARY
Moon over a city. The moon emerges from behind a cloud over a city at night. In the foreground is a sea wall with a lighthouse. The moon does not emit its own light but is visible because it reflects light from the sun. The light from a lighthouse, emitted as a sweeping beam, warns ships of the dangers of nearby rocks. The lighthouse beam is coded as a series of flashes. From this the crew of a ship may identify the lighthouse and use it as a navigational beacon. Photographed at Brockton Point near Vancouver, Canada.
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