Geostationary satellites can see the entire planet and let us watch the Earth evolve by using multiple satellites to build a full picture. To see the whole Earth, the pieces have to be ‘stitched’ together from pieces obtained at different instants all at the same local time (e.g., 13:30 for MODIS-AQUA). Satellites in low-Earth orbit collect high-resolution images swath by swath on consecutive overpasses. None of the modern Earth observing satellites, however, can see the entire sunlit side of Earth all at once. It energized grass-roots green movements and inspired young scientists who would go on to investigate climate change, forecast weather, and much more. The first “blue marble” photos taken by Apollo astronauts nearly 50 years ago sparked a new awareness of Earth as a fragile sphere of dazzling beauty floating alone in a dangerous void, worthy of careful stewardship.
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