After successfully installing a new camera on Hubble yesterday, astronauts have already begun their second spacewalk to perform more work on Hubble today.Today's activities will include replacing old gyroscopes, the devices to help keep Hubble in orbit, as well as batteries. Michael Massimino and Michael Good will be the two guys today performing the work. They will replace all six of the gyroscopes onboard Hubble and three of the 20-year-old batteries.
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