The National Aeronautics and Space Administration (NASA) estimates that without a servicing mission to replace key components, the Hubble Space Telescope will cease scientific operations in 2008. In January 2004, then-NASA Administrator Sean O'Keefe announced that the space shuttle would no longer be used to service Hubble. Hubble supporters criticized this as a result of President Bush's new Vision for Space Exploration; said supporters sought to reverse the decision and proceed with a shuttle servicing mission. In October 2006, NASA approved a shuttle mission to service Hubble. That mission is now scheduled for October 8, 2008.