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Extra-vehicular activity (EVA)
is work done by an astronaut away from the Earth and outside of a
spacecraft. The term most commonly applies to an EVA made outside a craft
orbiting Earth (a spacewalk). As of September 13, 2006, 158 astronauts had
made spacewalks
(out of 448 astronauts ever in space). These are some of the most
interesting moments in spacewalks history:
2. Ed White, the first American (june, 1965) ![]()
On June 3, 1965, Edgard
H. White became the first American to conduct a spacewalk. As
pilot of Gemini 4, White stepped outside the spacecraft for a 21-min
spacewalk during which he maneuvered on the end of a 7.6-m lifeline by using
a hand-held jet gun.
3. Bruce McCandless, floating free in space (1984) ![]() ![]() ![]() 4. Mark C. Lee, testing EVA Rescue unit (1994) ![]()
In 1994 astronaut Mark Lee tested the Simplified Aid for EVA Rescue (SAFER)
system for NASA. SAFER is a backpack propulsion unit that incorporates small
nitrogen thrusters controlled by hand and moderated by computer. Pictured,
Lee jets about the bay of Space Shuttle Discovery, over 200 kilometers above
Earth in the first untethered space walk in ten years. SAFER, smaller than
the Manned Maneuvering Unit, is designed as a backup system to help
astronauts in the unlikely event that they become too separated from their
work outside the International Space Station. [1]
5. Deep Space Spacewalkers (1971,72)
August 5, 1971. On the return journey, while about 275,000 km from Earth,
Alfred Worden went on a 41-minute spacewalk during which he was attached to
the CSM by a tether – the most distant EVA up to that time. In the
picture, astronaut Ronald Evans performs an EVA during the Apollo XVII on
December 17, 1972. Evans made three trips to the Service Module's Scientific
Instrument Module (SIM) bay to retrieve file cassettes in the last spacewalk
in deep space to date. [1]
[2]
Astronauts Musgrave and Peterson on the first spacewalk from the Shuttle, 1983. During the mission, both astronauts tested EVA equipment as well as construction and repair devices and procedures. [1]
7. Intelsat VI Satelite Rescue (1992)
May, 1993. Three crewmembers of mission STS-49 hold onto the 4.5 ton
International Telecommunications Organization Satellite (INTELSAT) VI after
a six- handed "capture" was made minutes earlier during the
mission's third extravehicular activity (EVA). From left to right: Richard
J. Hieb, Thomas D. Akers and Pierre J. Thuot. [1]
8. Spacewalks on the robotic arm Jerry L. Ross, anchored to
the robotic arm of the Atlantis. [1]
Mark C. Lee and Carl Meade on
Discovery shuttle, 1994. [1]
Stephen K. Robinson,
Discovery, August 8, 2005. [1]
Wisoff and Low, Endeavour,
december 1993. [1]
Michael Gernhardt, Endeavour
robotic arm. [1]
Peter J.K. Wisoff, december
2003. [1]
Bruce McCandless over Canadarm, february, 1984. [1] Satellites "for sale" ![]()
November 14, 1984. Astronaut Dale A. Gardner holds up a "For
Sale" sign refering to the two satellites, Palapa B-2 and Westar 6 that
they retrieved from orbit after their Payload Assist Modules (PAM) failed to
fire. [1]
The Hubble Space Telescope (HST) is a telescope in orbit around the Earth
and the only telescope ever designed to be serviced from space by
astronauts. To date, there have been four servicing missions, with a fifth
and final mission planned for September 2008. [1]
[2]
Astronaut F. Story Musgrave, anchored on the end of the Remote
Manipulator System (RMS) arm, prepares to be elevated to the top of the
Hubble Space Telescope (HST) to install protective covers on the
magnetometers. [1]
The International Space Station (ISS) is a research facility currently
being assembled in space. It travels at an average speed of 27,744 km
(17,240 miles) per hour, completing 15.7 orbits per day. Since 1998,
astronauts have worked hard completing the station. In the picture above,
International Space Station assembly EVA made during the STS-116 spaceflight
by astronauts Robert Curbeam and Christer Fuglesang as they fly over New
Zealand. [1]
Astronaut Piers Sellers working on ISS.
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