Credits: (NASA handout image)
The Roentgen Satellite (ROSAT), is expected to re-enter the Earth's atmosphere Saturday or Sunday, but scientists can not predict exactly when or where it will land.
Last month, NASA's Upper Atmosphere Research Satellite (UARS) landed northeast of the Samoan Islands in the Pacific Ocean.
On its website, DLR, the German space agency, says, "it is possible that up to 30 individual pieces weighing a total of 1.7 tons may reach the surface of the Earth."
It says the likelihood of a person getting injured as a result of the re-entry is extremely low.
"Taking account of the projected total surface area over which damage might be caused by the fragments that - theoretically - might survive re-entry, the orbital path of the satellite and the distribution of human populations on Earth, it is possible to calculate that the probability of someone somewhere on Earth getting injured is about 1 in 2,000," the site says.