Cosmonauts Gennady Padalka and Yuri Malenchenko, working in open space, have successfully launched the microsatellite Sphere.

During their spacewalk, Padalka and Malenchenko are also installing additional anti-meteor panels on the International Space Station.

The two cosmonauts are also retrieving from the outside surface of the ISS samples of materials that were there for a length of time to study the effects of cosmic radiation.

If the astronauts have time, they will perform a succession of other tasks.

The Russians ventured into raw space at 19:37 (GMT), and are scheduled to work in open space for about 6.5 hours.

ITAR-TASS

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