Hubble Spacewalk #4 Begins aboard Atlantis

Spacewalking astronauts are beginning the fourth repair day on aboard Atlantis this morning as Mike Massimino and Michael Good prepare to work on the change out of a circuit board which ran the now dormant Imaging Spectrograph on the Hubble Space Telescope.

Spacewalk #4 of the mission began at 9:45 am EDT, about 30 minutes later than planned due to a leak check with the boot of Good's spacesuit.

Extravehicular Activity or EVA 3 astronaut Massimino and EVA 4 Good will spend about 4 1/2 hours of the 6 1/2 hour spacewalk performing the change out the bad computer board on the spectrograph. Later, the pair will install insulation on one of Hubble's bay doors.

You can watch the entire spacewalk LIVE via spacelaunchnews.com.