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The former Soviet Union's launch of the world's first artificial satellite, Sputnik 1, heralded the era of satellite remote sensing. Since that epic moment on October 4, 1957, hundreds of Earth observing satellites have followed. Half a century of imagery has provided both iconic views and unprecedented scientific insights.doi:10.1511/2008.74.390 pmid:19498953 pmcid:PMC2690060 fatcat:tdcsogyh65e7xfffgjwxvxjuni