Landsat legacy: NASA–USGS program observing Earth from space turns 50 - Phys.org

On a warm July day in 1972, NASA launched a new Earth-imaging satellite called the Earth Resources Technology Satellite. "ERTS" was the first satellite of what later became NASA and the U.S. Geological Survey's Landsat Program, an ambitious effort with a visi…

On a warm July day in 1972, NASA launched a new Earth-imaging satellite called the Earth Resources Technology Satellite. "ERTS" was the first satellite of what later became NASA and the U.S. Geologic… [+6329 chars]

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