Risky spacewalk called off

International Space StationA risky spacewalk at the International Space Station is called off hurriedly, with astronaut Mike Fincke already through the open hatch. The oxygen container on Fincke’s spacesuit is the cause for concern, as mission controllers in Russia note that its pressure is rapidly dropping. Fincke and mission commander Gennady Padalka were en route to replace a circuit breaker, but due to a variety of other problems aboard the station they were exiting the station via the Russian-built airlock at the opposite end of the station from the breaker’s destination, requiring a 45-minute journey from one end of the station to the other. The spacewalk, rescheduled for a later date, will leave the station unoccupied with its entire crew outside for only the second time since the station became operational.