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Russia's space agency says it is unable to control its only radio telescope.
The Spektr-R satellite is continuing to transmit signals, but scientists have been unable to control it since Friday.
Rocosmos says its specialists are attempting to fix the issue.
Alexander Bloshenko, an official at the agency, said that another attempt to establish control will take place on Sunday.,
The satellite was launched in 2011 and has exceeded its initially expected useful life of about three years.
It used to study radio sources within and outside Earth's galaxy.
Additional reporting by AP.