NASA astronauts Sunita Williams and Nick Hague are set to step outside the International Space Station (ISS) for a spacewalk.

Two NASA astronauts are currently hard at work in space, patching up an instrument called NICER (Neutron star Interior Composition Explorer).

One of NASA's two stuck astronauts is getting a change of scenery. Suni Williams stepped out on a spacewalk Thursday, her first since arriving at the International Space Station seven months ago.

This event, known as US Spacewalk 91, is Williams' first in 12 years and her eighth overall, while for Hague, it's his fourth venture outside the ISS.

The two astronauts have a busy day ahead of them. Hague and Williams will "patch light leaks in the NICER X-ray telescope, then ready the Alpha Magnetic Spectrometer for future upgrades," NASA officials wrote in a Jan. 15 blog post.

After a gap of more than a year, NASA successfully resumed spacewalks outside the International Space Station on Thursday. NASA astronauts Nick Hague and Suni Williams, dressed in pressurized NASA spacesuits, moved through the Quest airlock and into the vacuum of space.

The pictures were taken inside the International Space Station last week, when Sunita Williams and Nick Hague donned spacesuits to carry out “fit checks.”

Astronauts Suni Williams and Nick Hague completed pivotal maintenance tasks on the International Space Station in their latest spacewalk, enhancing its research capabilities. NASA astronauts Suni Williams and Nick Hague successfully completed a 6-hour spacewalk on January 16,

During this spacewalk, Williams and Hague will step out to replace a rate gyro assembly which provides orientation control for the space station. They will install patches to cover the damaged areas of light filters for Neutron Star Interior Composition Explorer (NICER),

Preparations for an upcoming spacewalk continued aboard the International Space Station (ISS) as astronauts conducted health assessments and worked on their spacesuits. On Tuesday, the crew also dedicated time to biology,

NASA astronauts Nick Hague and Suni Williams, dressed in pressurized NASA spacesuits, moved through the Quest airlock and into the vacuum of space. This was the first NASA spacewalk since November ...

"NASA astronauts @AstroHague and @Astro_Suni suited up inside @Space_Station last week for fit checks ahead of their 6.5-hour spacewalk this Thursday," NASA tweeted.