The Earth has been the most frequent subject of photography in space. The large one is by the crew of Apollo 17 in 1972. The rest were by satellites. From top to bottom: the first picture of earth obtained from space, by the Explorer 6 satellite on Aug. 14, 1959; a 1998 image showing the hole in the earth's ozone layer; a 2001 image mapping heat, indicating possible future global warming.
(Photo: NASA)
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