Christina Koch and Jessica Meir venture outside ISS to replace faulty device in mission expected to last five and a half hours
Nasa began the first ever all-female spacewalk on Friday morning, sending two American astronauts out into the void to effect repairs to the International Space Station (ISS), following a power system failure at the laboratory high above Earth.
US astronauts Christina Koch and Jessica Meir made history as they stepped out of the orbiting lab and began floating around its structure in order to replace a faulty part of the solar power unit, which stopped working over the weekend.
Read More Nasa makes history as first all-female spacewalk begins