The failed Russian Mars probe, Phobos-Grunt, continued its descent to Earth on Saturday, losing hundreds of metres in height every hour.
By 23:00 Saturday (GMT), the 13-tonne spacecraft was circling the planet at a mean altitude of 147km.
It is likely to impact the thicker parts of the atmosphere and burn up sometime late on Sunday, according to orbital tracking experts.
The Russian space agency says little of the probe will survive to the surface.
It calculates no more than 200kg in maybe 20-30 fragments.
Precisely where on the Earth's surface - and when - this material could impact is impossible to say, however. There are huge uncertainties in forecasting the final moments of a re-entry.
http://www.bbc.co.uk/news/science-environment-16491457
get your hard hats on
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