During the first spacewalk of mission STS-103, astronauts successfully installed six fresh gyroscopes to fix the Hubble Space Telescope's broken pointing system and voltage regulators to protect the observatory's batteries. Images from NASA.

Suiting up John Grunsfeld dons his spacewalking suit aboard shuttle Discovery prior to the first EVA.
Getting set up Steve Smith installs a foot restraint on the end of Discovery's robotic arm. The platform will keep Smith anchored when moving around on the arm during installation of the RSUs.
What a ride Discovery's 50-foot robotic arm was key during the spacewalk, moving Smith and Grunsfeld around the telescope and payload bay. The arm was driven by French astronaut Jean-Francois Clervoy.
Quite an office Most of the first spacewalk was spent inside Hubble's aft shroud for Steve Smith. This was a unique workplace, allowing Smith to replace the failed gyroscopes that shut down Hubble's science program in November.
Keeping things packed Spacewalker John Grunsfeld places an old Rate Sensor Unit containing two gyroscopes in a bag for return to Earth.
Thumbs up Spacewalker Steve Smith gives a thumbs up to the crew inside shuttle Discovery.
A trio shot The tip of Hubble is seen with the full moon and Earth.