U.S. Senator Barbara Mikulski (D-MD), ranking Democrat on the commerce, justice and science subcommittee of the Senate Appropriations Committee, answers questions at a news conference at the Goddard Space Flight Center in Maryland, October 31, 2006. NASA announced earlier in the day that there will be a shuttle mission, planned for May 2008, to service the Hubble Telescope and keep it operational through 2013. (Jonathan Ernst/Reuters)