Hubble Servicing Mission 4 Blog
Second spacewalk today
15 May 2009, 12:46 UTC
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Today, astronauts Mike Good and Mike Massimino will conduct the second EVA (or spacewalk). On the agenda will be the replacement of three rate sensing units, part of the important gyro assemblies. The gyro assemblies are vital components as they sense vehicle motion and provide rate data to help aim Hubble precisely for its science observations.