Quarks to Quasars

Hour of (No) Power

Credit: ESA/NASA

Friday, April 6, 2012: ESA astronaut André Kuipers took this photo of the coast of North Africa and the Mediterranean Sea from the International Space Station on March 31, 2012. It was released during Earth Hour, a worldwide effort to raise awareness of sustainability issues by encouraging people to turn off their electric lights for an hour.

— Tom Chao

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