S82-E-5560 (16 Feb. 1997) --- On the Space Shuttle Discovery's aft flight deck, astronaut Joseph R. Tanner keeps up with the progress of his crew's third Extravehicular Activity (EVA) to service the Hubble Space Telescope (HST). Earlier, wearing an Extravehicular Mobility Unit (EMU), he participated in the second EVA, and he will join Gregory J. Harbaugh on the fourth tomorrow. This view was taken with an Electronic Still Camera (ESC).