NASA is preparing to launch a fleet of tiny spacecraft that may foreshadow a way out of the Earth-science box in which it finds itself. The global view its Earth-observation satellites provide is one of the best ways scientists have of tracking changes in the environment caused by human activities, but the satellites are expensive. There are those in Congress, some of whom speak for industries that contribute to those changes, who do not want the U.S. space agency to spend their ...

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