text: NASA Approves Robotic Hubble Repair Mission (AP) -- NASA's chief is urging his Hubble Space Telescope team to press ahead with plans for a robotic repair mission to the aging observatory, saying, "Let's go save the Hubble."    Administrator Sean O'Keefe says he will ask Congress for money to accomplish the job. He estimates it will take about \$1 billion to \$1.6 billion to develop and launch a robot to make the needed upgrades to keep the popular telescope running and to get it out of orbit once its work is through...