Todays spacewalk marks the second time this year astronauts will brave the vacuum of space outside the International Space Station (ISS). You can watch the action unfold in the embedded NASA TV stream below.

Live coverage of the spacewalk will see astronauts Jessica Meir and Christina Koch don their bulky spacesuits.

The NASA astronauts last ventured outside of the orbital laboratory on Wednesday, January 15.

The all-female team is tasked with replacing the batteries that store and distribute the space stations power.

NASA will stream the spacewalk live online from around 10.30am GMT (5.30am EST) today (January 20).

READ MORE:NASA proposes using MUSHROOMS for Mars habitats

The NASA spacewalk will be broadcast on NASA TV, through the space agencys website and YouTube channel.

You can tune in to NASA TV via the embedded video player above, courtesy of NASA.

In addition, NASAs round-the-clock broadcasts are free to watch on UStream and terrestrial television.

Live coverage will begin 10.30am GMT (5.30am EST) and the spacewalk itself will kick off at 11.50am GMT (6.50am EST) today.

Starting in October 2019, astronauts on the ISS have embarked on a series of spacewalks to upgrade the space stations batteries.

The stations solar arrays collect energy during the brief periods of daylight and the batteries then redistribute that power when in the nightside.

NASAs Mark Garcia said: This is the second of two battery replacement spacewalks in five days to complete the upgrade of batteries that store and distribute power generated by the stations solar arrays on the stations port truss.

Meir and Koch will replace nickel-hydrogen batteries with newer, more powerful lithium-ion batteries for the power channel on one pair of the stations solar arrays.

The batteries were delivered to the ISS in September last year on board a Japanese H-II Transfer Vehicle.

A similar set of battery replacements was last carried out in January 2017.

Before todays event, Mrs Koch shared some of the behind-the-scenes preparations.

The astronaut tweeted from space photos of her braiding Dr Meirs hair to fit in their NASA-issue spacesuits.

Mrs Koch tweeted: Spacewalk time! After all the technical studying, airlock prepping, and conferencing, @Astro_Jessica and I multitask as we do our final briefing.

Spacewalk hair pro tip: Double braid is the way to go fits snug under the com cap, out of the helmet seal, and no flyaways!

View post:

NASA spacewalk LIVE stream: How to watch NASA's all-female spacewalk live online today - Express.co.uk