Zero Hour: China's space station Tiangong-1 to crash into Earth within four weeks

China’s first space station Tiangong-1 is expected to come crashing down to Earth within the next four weeks, if scientists are to be believed. It is being estimated that Tiangong-1 will crash into the earth anytime between March 24 and April 19. Watch News Nation's exclusive programme Zero Hour to see a detailed report on the same.