Spacewalking astronauts give the Hubble Space Telescope a better view of the cosmos by installing a new high-tech science instrument and fixing a broken camera .shuttle Atlantis' crew's got third spacewalk in three days and was expected to be the most challenging ever performed because of the unprecedented camera repairs. Astronauts have never tried to take apart a science instrument at the 19-year-old observatory.
John Grunsfeld and Andrew Feustel got started on the daunting job Saturday morning as the joined shuttle and telescope soared 350 miles (560 kilometers) above the planet. Orbiting so high put Atlantis and its astronauts at an increased risk of being hit by space junk. NASA had another shuttle on launch standby in case a rescue was needed.
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