Sheer negligence by not including something to break up a large mass before it hits reentry..

Lynda

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By Jonathan Amos

Debris from a Chinese rocket is expected to fall back to Earth in an uncontrolled re-entry this weekend.

The main segment from the Long March-5b vehicle was used to launch the first module of China's new space station last month.

At 18 tonnes it is one of the largest items in decades to have an undirected dive into the atmosphere.

The US on Thursday said it was watching the path of the object but currently had no plans to shoot it down.

Various space debris modelling experts are pointing to late Saturday or early Sunday (GMT) as the likely moment of re-entry. However, such projections are always highly uncertain.

The zone of potential fall in this case is restricted still further by the trajectory of the rocket stage. It's moving on an inclination to the equator of about 41.5 degrees. This means it's possible already to exclude that any debris could fall further north than approximately 41.5 degrees North latitude and further south than 41.5 degrees South latitude.