An anonymous reader writes "Some scientists are questioning whether the robotic mission to repair the Hubble Space Telescope is worth the risk and cost. After the Columbia disaster, NASA cancelled its shuttle mission to Hubble, and replaced it with a robotic mission. However, the price tag of the robotic mission is between $1 billion and $2 billion, almost the cost of a new space telescope. Optics expert Duncan Moore is unsure whether the mission will bring the most scientific return per dollar spent. Hubble director Steven Beckwith says the mission will lead to breakthroughs in space robotics."