The space lab was designed to be a habitable station — it's 530 cubic feet (15 cubic meters) inside — for docking and orbital experiments, according to the Aerospace Corporation. The lab has two sleep areas for astronauts.
Here, commander Jing Haipeng waves to a camera after boarding the Tiangong 1 space module following a successful June 18, 2012 docking.
Bits of Tiangong-1 reentering Earth's atmosphere will make up just one of lots and lots of space debris orbiting our planet. About 500,000 pieces of debris are orbiting Earth, and about 20,000 of those are bigger than a softball.