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These Incredible Photos From Astronauts Show The Brightest Cities On Earth 

Cities at Night was launched by some Spanish astrophysicists who started following an astronaut’s Twitter account. “For us his nighttime pictures were like fire for a firefighter—it’s pretty, but you must control it,” says Alejandro Sanchez from Complutense University of Madrid. “We want to make the nighttime images useful for citizens, journalists, and scientists. And make this beauty accessible—but also make people think about if all this waste of energy is really needed.”

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