NASA astronauts Steve Swanson and Rick Mastracchio completed a 1.5-hour spacewalk on Wednesday to replace a failed Multiplexer/Demultiplexer (MDM) back up computer aboard the International Space Station.
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The spacewalk started just before 10 a.m. ET when the crew switched their suits to battery power, signaling the start of the operation. They began their re-pressurization sequence in the ISS's airlock at 11:32 a.m. ET, which signifies the excursion’s end time.
The astronauts replaced a backup computer which failed on April 11.
The computer controls certain systems associated with robotics on the space station, specifically providing "telemetry and commands to truss systems, solar alpha rotary joints and the Mobile Transporter rail car which rides along the truss structure," according to NASA.
You can watch the entirety of the spacewalk live, compliments of NASA TV.