Hubble engineers in the control center watch on large screens the astronauts close the spacecraft's lower doors.

Hubble Control Center – Servicing Mission 4

Flight controllers at Goddard Space Flight Center's Space Telescope Operations Control Center monitor progress during the third spacewalk of Hubble's Servicing Mission 4. On screen, astronauts access Hubble's aft shroud doors as part of the operation to remove the Corrective Optics Space Telescope Axial Replacement (COSTAR) and install a new instrument, the Cosmic Origins Spectrograph.

Credits: NASA