Hubble Servicing Mission 4 Blog

Fourth spacewalk today

by colleen on May.17, 2009, under SM4

Astronauts Mike Massimino and Mike Good will conduct SM4’s fourth spacewalk today, focusing on the repair of the STIS instrument (Space Telescope Imaging Spectrograph). A power supply failure in 2004 rendered the “black hole hunter” inoperable. Watch NASA’s video about the STIS repair.

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