As NASA spokesman Dan Hout told TASS, the astronauts will perform a 200th spacewalk in the entire history of the International Space Station, which will last about six hours and a half.
Astronauts Peggy Whitson and Jack Fischer put on spacesuits Friday to head outside the International Space Station for several fix and maintenance tasks, but the duo will likely only complete part of their work after a leaky cooling umbilical delayed the start of their spacewalk.
Whitson already holds the record for most spacewalks by a female astronaut, according to NASA.
"Outstanding, Peggy", came the voice from Houston's Mission Control.
Spacewalkers have now spent a total of 1,247 hours and 55 minutes working outside the station during 200 spacewalks in support of assembly and maintenance of the orbiting laboratory, NASA said.
Friday's mission was Whitson's ninth spacewalk.
The box weighs 200 pounds (91 kilograms) on Earth, and routes data and commands to experiments inside the space station, Navias said.
American astronauts Peggy Whitson and Jack Fischer's spacewalk was delayed slightly this morning due to a water leak in one of the suits.
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The leaky hose had to be disconnected before the spacewalk could begin.
Fischer has never spacewalked before. The adaptor will enable companies like SpaceX and Boeing to visit the station, making it an important port for the future of space exploration.
The EVA started over the Pacific Ocean near Hawaii and lasted 23 minutes, ending over the Gulf of Mexico.
An issue with some gear inside the airlock ahead of the spacewalk forced mission managers to delay the start time and shorten the walk in space.
NASA's bulky white spacesuits are aging, and the same models have been in use for four decades.
The firs spacewalk in support of ISS assembly and maintenance was December 7, 1998 during a mission by the crew of the space shuttle Endeavour.
"Oh my gosh, this is handsome", Fischer said as he stepped out into space for the first time, saying his view is like "an enormous fondu pot bubbling over with piping hot awesome-sauce".