CAPE CANAVERAL: Astronauts John Grunsfeld and Drew Feustel will exit the space Shuttle Atlantis Thursday morning for the first of five space walks to upgrade Hubble. Astronauts will replace the telescope's 15-year-old workhorse camera with one that sees deeper into the universe. The new camera is the size of a baby grand piano. The old camera will be displayed at the Smithsonian Institution.This space walk should take about six-and-a-half hours and includes replacing a computer data device that broke down last year. Atlantis grabbed Hubble Wednesday and shuttle commander Scott Altman said the two spacewalkers were ``salivating over the telescope.''
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