NASA astronauts Tracy C. Dyson and Matt Dominick, two of the
orbiting laboratory's six U.S. astronauts, donned their
spacesuits early on Thursday morning in preparation for a
roughly six-hour trek outside the ISS for routine repairs and a
science mission, as shown on a NASA live stream.
As other U.S. crewmembers prepped the two astronauts inside the
station's Quest airlock - the exit module separating the
station's interior from the vacuum of space - NASA astronaut
Mike Barratt asked flight controllers in Houston for a private
communications line to discuss a medical issue.
Minutes later a NASA spokeswoman speaking on the live stream
said "today's spacewalk will not be proceeding as planned."
"The spacewalk today, June 13, at the International Space
Station did not proceed as scheduled due to a spacesuit
discomfort issue," NASA later said on its website.
The spacewalk mission was poised to be NASA's 90th in the space
station's 23-year history, and the second this year. It would
have been the fourth spacewalk for Dixon, who first flew to
space in 2007, and the first for Dominick.
It was not clear what caused the spacesuit discomfort or whether
an independent astronaut medical issue was a factor.
Past spacewalks have been called off over issues with the
station's spacesuits, which were designed nearly half a century
ago with only minor redesigns and refurbishments. NASA's
inspector general has said they are ripe for an upgrade, which
NASA is paying Raytheon's Collins Aerospace to do.
Before Thursday's spacewalk cancellation, NASA on Wednesday
night accidentally broadcast on its live YouTube feed a
simulated emergency of astronauts being treated for
decompression sickness on the ISS, raising public alarm about
the health of U.S. crewmembers.
NASA said there was no real emergency and that "audio was
inadvertently misrouted from an ongoing simulation where crew
members and ground teams train for various scenarios in space
and is not related to a real emergency."
(Reporting by Joey Roulette; Editing by Bill Berkrot)
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