The two astronauts first made history on October 18, 2019, on NASA’s first all-female spacewalk. The astronauts ventured out into the vacuum of space for the second time this year on Wednesday, January 15.

The first spacewalk of the year was also the first of three planned before the end of the month.

On January 20 and January 25, the space station’s crew will continue to upgrade the ISS’ critical power systems and other equipment.

This week, Dr Meir and Mrs Koch installed two new lithium-ion batteries on the space station’s Port-6 truss.

The batteries gather energy from the Sun during the day and power the ISS at night.

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On the orbital laboratory daytime and nighttime only last about 45 minutes each as the ISS completes a lap around our planet every 90 minutes.

Every 24 hours, the ISS witnesses a total of 16 sunsets and 16 sunrises.

After NASA’s astronauts completed their seven-and-a-half-hour servicing mission, Mrs Koch took to Twitter to share her experience.

The astronaut also shared two pictures snapped by ISS Commander Luca Parmitano from the European Space Agency (ESA).

Mrs Koch tweeted from space: “From inside the @Space_Station, @astro_luca snapped these #spacewalk photos, capturing a moment of teamwork that I will never forget.

“Halfway through another power channel of battery changes and looking forward to finishing up next week!”

NASA astronaut Jessica Meir takes an out-of-this-world ‘space-selfie’

NASA

NASA’s Johnson Space Center then shared more photos from the spacewalk, including a beautiful “space selfie” taken by Dr Koch.

NASA said: “NASA astronaut Jessica Meir takes an out-of-this-world ‘space-selfie’ during a spacewalk she conducted with NASA astronaut Christina Koch – out of frame – to install new lithium-ion batteries that store and distribute power collected from solar arrays on the station’s Port-6 truss structure.”

You can just see in the curved reflection of the astronaut’s domed helmet the blue waters and white cloud tops of the planet below.

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In another NASA picture, you can see Mrs Koch working on the ISS with a beautiful view of Earth behind her.

The picture was taken about 265 miles up in space, while the ISS was passing over the Atlantic Ocean off the coast of Africa.

In another picture, you can see Mrs Koch smiling through her airtight helmet.

The next spacewalk is scheduled to take place on January 20 and will once again involve Dr Meir and Mrs Koch.

After that, NASA astronaut Andrew Morgan and Commander Parmitano will leave the space station this year’s third spacewalk.

NASA’s Mark Garcia said: “They will finish the complex thermal repair work they began last year on the Alpha Magnetic Spectrometer, an astrophysics device searching for evidence of antimatter and dark matter.”

There are currently six people living and working on the orbital laboratory.

The crew members are NASA’s Jessica Meir, Christina Koch and Andrew “Drew” Morgan.

The astronauts are joined by ISS Commander Luca Parmitano from Italy and Russian cosmonauts Alexander Skvortsov and Oleg Skripochka.

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