MOSCOW — An Olympic torch took a spacewalk for the first time Saturday, carefully held by two Russian cosmonauts outside the International Space Station as it orbited some 260 miles above Earth. Video streamed by NASA showed Oleg Kotov and Sergei Ryazanskiy carrying the unlittorch of the Sochi games, which bobbed weightlessly at the end of a tether in a darkness dotted by stars. The two gingerly maneuvered to take photos of the torch against the background of the planet, the orb's edge glowing with sunrise.