How cold was it? So cold that astronauts Bernard Harris and Mike Foale could have seen their breath (except that water vapor doesn't condense in space helmets); so cold that they could have heard their footsteps crunch (except that they were walking on less than air); so cold that they had to cut short their spacewalk from the shuttle last week. Bingo. The goal was to test thick gloves designed to let future astros build a space station in orbit without getting frostbite. But in the shadow created by the shuttle, it was minus 90 to minus 125 degrees Fahrenheit: space, unlike Earth, has no atmosphere to hold onto the sun's infrared radiation so any warmth just zips toward Pluto. The gloves couldn't take it. So much for space-age materials. ""We found out that . . . it gets cold outside,'' Harris told reporters from 200 miles up. Mission accomplished.