BEIJING (AP) — China’s defunct and reportedly out-of-control Tiangong 1 space station is expected to re-enter Earth’s atmosphere sometime this weekend. It poses only a slight risk to people and property on the ground, since most of the bus-size, 8.5-ton vehicle is expected to burn up on re-entry, although space agencies don’t know exactly when or where that will happen.

Below are some questions and answers about the station, its reentry and the past and future of China’s ambitious space program.

 

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