A defunct Chinese space station is falling back to Earth. <br /> The European Space Agency says the Tiangong-1 will enter Earth's atmosphere sometime between Friday and Monday, but the exact time of the uncontrolled fall is hard to predict. <br />The ESA says its debris could be showered over an area covering thousands of square kilometers, but noted the risk to people will be very small.<br />The Tiangong-1 space station was put into orbit seven years ago as a prototype for China's ambitious space program. <br />
