Only one Russian space radio telescope is no longer responding to Earth commands, officials said.
Astro Space Center chief Nikolai Kardashev told Spektr-R to stop working on some satellite communication systems.
Scientific data is still transmitting, as reported by the RIA Novosti agency.
The telescope exceeds its estimated five-year duration, as Roskosmos of the Russian space agency says.
While the specialists repeatedly tried and missed the connection, Mr Kardashev said.
Yuri Kovalev, a researcher at the Spektr-R project, tightened his bond on 11 January, but "there is no hope".
Spektr-R started in space in 2011
A new German and Russian satellite, Spektr-RG, will be launched this year.