Astronauts have struggled to complete the most critical repair to the Hubble Space Telescope in a second spacewalk.Mission specialists Mike Good and Mike Massimino put a refurbished pair of gyroscopes into the telescope after a new set refused to go in.Besides the gyroscopes - to orient it precisely - Hubble got fresh batteries to ensure five more years of life.Despite the setbacks, scientists said Hubble would function well, pointing to ever distant objects in the cosmos.Friday's troubled spacewalk was the longest yet, lasting eight hours."At times, I felt like I was wrestling a bear," Mike Massimino was quoted as saying by AFP news agency, as he and Mike Good struggled to install the gyroscopes, or "rate sensing units" (RSUs).Previously, only three of the six gyroscopes worked. But after today's marathon spacewalk, Hubble has four brand new sets and two refurbished ones. Only two are needed to orient the telescope properly.
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