Landsat has been watching Earth from space for four decades. As the next-generation LDCM satellite prepares to launch, we look at what Landsat has shown us so far.To kick off this 40th anniversary gallery of images collected over the decades from NASA's Earth observation program, we might as well start with a Landsat shot that appeals to the narcissistic side of many CNET readers -- this is a view of the San Francisco Bay area as of 2011. [Read more]
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