Spacewalk. Astronaut Steven L. Smith waves his hand during an Extravehicular activity (EVA) or spacewalk during a space shuttle mission to repair the Hubble Space Telescope. Smith is seen here near the foot restraint of the Remote Manipulator System robot arm in the cargo bay of the shuttle Discovery during mission STS-82 (11-21 February 1997). This mission was the second to service the HST since its launch in 1990. During the servicing, improved instruments were added and some aging components were replaced. The shuttle also lifted the HST into a slightly higher orbit.