Watch Las Vegas massive growth since 1973 till now. It starts a bit slow, but then it becomes fast and unstoppable. It looks scary, especially if you are a coyote or a dead mobster buried in the desert.
The large red areas are actually green space, mostly golf courses and city parks. You'll notice the images become a lot sharper around 1984, that's when new instrument designs greatly increased their sensitivity.
The images were taken by some of the many Landsat satellites that have been launched into orbit. These satellites "have been instrumental to our increased understanding of forest fires, storm damage, agricultural trends, and urban growth" through the entire world.
According to NASA, the next Landsat satellite is scheduled for a launch in January 2013.
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