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Today, Earth is constantly monitored by thousands of satellites for both good and evil purposes. Their findings have been invaluable in monitoring natural disasters and predicting patterns. Here's an image of Hurricane Katrina in 2005 as it approaches land.
Here's the U.S. at night, taken by Japan's Suomi NPP satellite in 2012.
Credit: NASA Earth Observatory/NOAA NGDC
While not an actual photograph, NASA uses expertise from its long history or Earth images and study to create this group of images which show the depletion of our ozone layer.