(CNN) NASA astronauts Jessica Meir and Christina Koch are conducting the first all-female spacewalk outside of the International Space Station. The spacewalk officially began when the batteries in their spacesuits activated. Then, they exited the airlock.

In order to tell the astronauts apart, Koch's helmet camera views will bear the number 18 and Meir's will be number 11. Koch's spacesuit also has red stripes on it. 

This will be the fourth spacewalk for Koch and the first for Meir. Based on their position on the platform, the astronauts will be able to see the Earth pass beneath their feet.

Upon watching the spacewalk begin, NASA astronaut Tracy Dyson said she hopes this is just the first all-female spacewalk and that it becomes a normal occurrence.

The first woman to conduct a spacewalk was Russian cosmonaut Svetlana Savitskaya in 1984, followed closely by NASA astronaut Kathy Sullivan. An additional 12 US women have conducted 40 spacewalks over the past 35 years. Koch and Meir will be 13th and 14th, respectively.

Koch and Meir spoke about women working in human spaceflight during a recent news conference.

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