by Douglas Messier Managing Editor China has once again put another massive rocket stage in orbit, triggering a week-long guessing game as to where and when it will reenter the atmosphere and whether debris will rain down over a populated area. The object in question is the core stage of a Long March 5B rocket, which entered orbit after launching the new Wentian module to the Chinese space station. The stage is 53.6-meter-tall and weighs approximately 23 metric tons. “Due to the uncontrolled nature of its descent, there is a non-zero probability of the surviving debris landing in a populated...