By Steven Freeland* A large piece of space debris, possibly weighing several tonnes, is currently on an uncontrolled re-entry phase (that's space speak for "out of control"), and parts of it are expected to crash down to Earth over the next few weeks. The Long March-5B Y2 rocket, carrying the Tianhe module, blasts off from the Wenchang Spacecraft Launch Site in south China's Hainan Province on 29 April, 2021. Photo: Xinhua News Agency If that isn't worrying enough, it is impossible to predict exactly where the pieces that don't burn up in the atmosphere might land. Given the object's orbit, the possible landing points are anywhere in a band of latitudes "a little farther north than New York, Madrid and Beijing and as far south as southern Chile and Wellington, New Zealand".