The Soviets have opened a new phase in space exploration with the launch of the world's biggest space station, Mir.
The successful launch of Mir comes just over three weeks after the American space shuttle Challenger disaster, in which seven astronauts died.
At next week's Communist Party congress in Moscow the Mir project is likely to be hailed as proof that the Soviets are leading the peaceful exploration of space.
Mir, which means both peace and world in Russian, is intended to provide a base for a permanently manned complex orbiting the Earth.
Too costly
It succeeds the Soviet Salyut models, the last of which, Salyut 7, was launched in April 1982 and is still in orbit.
The Americans also had a space station, Skylab, which suffered damage on its initial launch and eventually proved too costly to maintain and fell back to Earth in 1979.
Soviet officials say their new craft represents the transition from research to large-scale production activities in space.
The station has six docking stations, which means other modules or laboratories can be added to it, expanding its size and capability.
Remain in orbit
The deputy head of the Soviet cosmonaut training centre, Alexei Leonov, said it would only be possible to determine how long Mir would remain in orbit after it had completed its first flight.
He said the cosmonauts, now taking part in a special training programme, would have separate cabins with windows and even individual desks and armchairs.
Mr Leonov explained that Salyut 7 was too small for the plans now being implemented by Soviet experts.
It has only two docking stations and can support a crew of only three, whereas Mir can carry between six and ten people.
The main work of the first cosmonauts on board Mir will be to continue with the experiments in materials processing, begun on Salyut 6 and 7.
Other activities will include observation of the Earth using high-powered cameras, as well as helping locate mineral deposits on Earth and monitor the seas for trawlers.
1986: Soviets launch space station Mir
