Experts are warning that an eight-ton Chinese space laboratory that has a deteriorating orbit path will likely crash into Europe in early April—but there’s a bit of disagreement on exactly when and, indeed, where. 

Tiangong-1 is a satellite laboratory that contains large amounts of hydrazine, which is a toxic and flammable chemical that can wreak all kinds of havoc on the human body, including poisoning the blood, kidneys, lungs, the central nervous system, and damage to eyes, nose, mouth, and respiration. It can also produce severe burns on the skin. 

America’s Aerospace Corporation (AAC) predicts the first week of April for re-entry and the crash landing of some of the pieces, while the European Space Agency (ESA) has a much larger window of March 24 to April 19. 

told The Guardian. “Every couple of years something like this happens, but Tiangong-1 is big and dense so we need to keep an eye on it.”