1) Modern outdoor sport 2) Stroll around the station 3) To perform a spacewalk 4) What NASA calls an EVA 
[software] Spacewalk is open source systems management software developed by Red Hat. It is the upstream version of the Red Hat Satellite, which was open sourced in 2008. Spacewalk includes the web interface and back-end, as well as Red Hat Proxy Server and associated client software of Satellite and makes them available to users and develo...
(from the article `Physical Sciences`) ...heat-shield tiles and the orbiter`s aluminum skin. Because of uncertainties about excessive heating that might occur around the protrusions during ...
Alexei Leonov conducts the first spacewalk in history on March 18, 1965, during the Voskhod 2 mission An excursion outside a spacecraft or space station by an astronaut wearing only a spacesuit and, possibly, some sort of maneuvering device. A standup spacewalk is when the astronaut remains parti...
an occasion when an astronaut goes outside the spacecraft in space, for example to repair something
To leave a spacecraft and go out into space in a special suit