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. China’s defunct Tiangong 1 space station is expected to re-enter Earth’s atmosphere later Sunday.

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. China’s defunct Tiangong 1 space station is expected to re-enter Earth’s atmosphere later Sunday.