How to Track Chinese Rocket Long March 5B That Is Falling to Earth 'Uncontrolled' On 5/4/21 at 7:45 AM EDT A used Chinese rocket is currently tumbling through space and scientists do not know exactly when or where it will return to Earth—but it could be soon. The rocket, a Long March 5B, was used to place the core module of China's planned Tianhe space station into orbit on April 28. The rocket released the module but has since been drifting around the Earth, gradually getting lower and lower. It can be tracked using services such as orbit.ing-now, which says it uses third-party data "believed to be reliable."