In mapping the effects of an atomic bomb, such as on the city of Hiroshima, concentric circles are drawn centered on the point below the detonation and numbered at radial distances of 1,000 feet (305 meters). This point below the detonation is called Ground Zero.

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Photography is the art, science & practice of creating durable images by recording light. Typically, a lens is used to focus the light reflected or emitted from objects into a real image on the light-sensitive surface inside a camera during a timed exposure.
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