A Soviet nuclear-powered satellite with which ground controllers have lost radio contact will return to Earth between Oct. 4 and 8 but there is no radiation danger, Tass news agency said on Saturday.

Although Soviet scientists were tracking its flight on a low almost circular orbit, they could not yet tell exactly where it would crash, Tass added.The satellite, Cosmos-1900, was launched on Dec. 12, 1987, to help study the world's oceans. Radio contact was lost earlier this year.