The space station's two American astronauts went out on a riskier than usual spacewalk Wednesday to fix one of two equipment failures that have crippled their power system and threatened to stall construction.
Commander Peggy Whitson and Daniel Tani floated outside well before dawn, hauling a new motor that NASA hoped would enable a solar wing to tilt toward the sun again and draw more power for the orbiting complex.
The spacewalk had barely begun when a radio-relay problem cropped up, preventing Whitson and Tani from hearing Mission Control. Flight controllers managed to restore communication through a backup channel within 20 minutes, allowing the spacewalk …
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