Clock Ticking As Defunct Space Lab Hurtles Toward Earth

BEIJING (CBSNEWS.COM) – 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 re-entry and the past and fut