DAVID DUCROS / SCIENCE PHOTO LIBRARY DAVID DUCROS / SCIENCE PHOTO LIBRARY
Spot-4 satellite. Computer artwork of the Spot- 4 satellite, a French Earth observation satellite backdropped over planet Earth. This satellite is equipped with high-resolution cameras (both upper left) which can record images of Earth in visible and infrared light. The resolution is around 20 metres over a 60 kilometre square image. Spot 4 was launched on 24 March 1998 by an Ariane 4 rocket. It orbits at a height of 822 kilometres. It is powered by electricity generated in its solar panels (blue, centre right and upper centre). The majority of the rest of the satellite is taken up with its guidance systems.
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