Mike Good and Mike Massimino put a refurbished pair of gyroscopes into Hubble
Astronauts have completed the most critical repair to the Hubble Space Telescope after a long struggle.
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 - the second - 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.
The spacewalk was the 20th undertaken in the service of Hubble, but was Mike Good's first.
"Welcome to the wonderful world of working in a vacuum," Mike Massimino told him as he exited the airlock.
HUBBLE SPACE TELESCOPE
Named after the great US astronomer Edwin Hubble
Launched in 1990 into a 600km-high circular orbit
Equipped with a 2.4m primary mirror and five instruments
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