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—lewis thomas sixty years ago, with the launch of explorer , nasa made its first observations of earth from space. fifty years ago, astronauts left earth orbit for the first time and looked back at our "blue marble." all of these years later, as we send spacecraft and point our telescopes past the outer
and microcosm, from the flow of one mountain stream to the flow of jet streams. most of all, we look at earth as a system, examining the cycles and processes—the water cycle, the carbon cycle, ocean circulation, the movement of heat—that interact and influence each other in a complex, dynamic dance across...
https://earthobservatory.nasa.gov/features/earth-book-2019