An out-of-control Chinese space station moving at 17,000mph is set to plummet to Earth over the Easter weekend, leaving space experts scrambling to guess where.

Tiangong-1, or "The Heavenly Palace," could re-enter the atmosphere over a major city and scientists will not know until a few hours before it happens.

China's first space station, which weighs eight tonnes, was supposed to have a "controlled re-entry" splashing down in the Pacific Ocean thousands of miles from civilisation.

But in March 2016 communication with it was lost and Chinese scientists were no longer able to fire up its engines.

It has since been orbiting in an ever-descending death spiral. On Tuesday it was at an altitude of 130 miles and falling faster than ever before.

The space station was expected to re-enter the atmosphere between March 31 and April 4.