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before. Anything could go wrong due to the lack of planning. But now
there was no time to wait. The doctor from Georgia had to pull on his
space suit and head out into the icy blackness to save the day.
Marshburn and fellow astronaut Christopher Cassidy moved into
the
airlock
on board the ISS. They had spent the previous few hours
going over their tasks. Teams on the ground had shown them what to
do, and they looked at diagrams of what they would find outside. Out-
side the window, they could see small chips of frozen ammonia leaking
into space. If that leak turned around and leaked inside the station,
it could be very dangerous for the men living aboard. The ammonia
also helped keep power grids cool. Without that power, some of the
9
After putting on his space suit, Marshburn went through the airlock and into the freezing, airless
environment outside the International Space Station.