The U.S. Space Command is tracking uncontrolled debris from a Chinese rocket that sent part of a planned space station into orbit last week, the White House said on May 5. The debris comes from the Long March 5B rocket launched on April 29 to deliver a new 22.5-tonne module for China’s Tianhe space station. The debris has since reached orbital velocity, meaning it is circling the planet instead of falling back to Earth within a predetermined area as usually happens with the debris from U.S. launches. Losing its ability to restart its engines, the debris is tumbling on a trajectory towards Earth at over 17,000 miles per hour and its reentry point can’t be predicted accurately at present. “Its exact entry point into the Earth’s atmosphere cannot be pinpointed until within hours of its reentry, which is expected around May 8,” U.S. Department of Defense spokesman Mike Howard said in a …