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Blue Marble image of Earth Composite satellite image of Earths western hemisphere centred on the Atlantic Ocean North is at top The image is one of a set entitled Blue Marble Next Generation released in October which improves upon Blue Marble The new images combine data collected over a longer period of time at an improved resolution of metres per pixel Features include cloud cover oceans phytoplankton activity topography and city lights in the nighttime part of the hemisphere Data was obtained mainly by NASAs Moderate Resolution Imaging Spectroradiometer MODIS aboard the Terra and Aqua satellites between July and July Topography is based on radar data collected by the Space Shuttle Endeavor

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