SPACE.com:
Atlantis astronauts headed out to the
Hubble Space Telescope
Sunday to attempt the second daunting repair of their
mission: resurrecting a long-broken instrument that can sample
the atmosphere of distant alien planets. It is their fourth
spacewalk out of the five scheduled for the repair mission.
Spacewalkers Michael Massimino and Michael Good left the space shuttle at 9:45 a.m. EDT (1345 GMT) to resuscitate the Space Telescope Imaging Spectrograph, which failed after a power failure in 2004.
