space junk space junk

Visitors sit beside a model of China's Tiangong-1 space station in 2010, at the 8th China International Aviation and Aerospace Exhibition in Zhuhai in southern China's Guangdong Province. As forecast, China's defunct Tiangong 1 space station re-entered Earth's atmosphere Sunday. Kin Cheung/AP hide caption

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Kin Cheung/AP

An image, from North Korea's official Korean Central News Agency (KCNA), of what's said to be the launch on Wednesday. AFP/Getty Images hide caption

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AFP/Getty Images