* Astronauts hook up spare radiator

* Station maneuvered to avoid space debris

* Russian cargo ship arrives; being unloaded

CAPE CANAVERAL, Fla., Nov 1 (Reuters) - A pair of

spacewalking astronauts floated outside the International Space

Station on Thursday to bypass a leak in one of the outpost's

cooling systems.

Engineers suspect a micrometeoroid or tiny piece of space

debris may have punched a hole no bigger than the width of a

hair into one of the station's radiators.

Read more:

UPDATE 1-Spacewalkers tackle coolant leak on space station