NASA astronauts Nick Hague and Suni Williams completed a six-hour spacewalk to repair and upgrade equipment outside the International Space Station on Thursday (Jan. 16).

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.

At the time of writing, Williams and ISS crewmate, Nick Hague, are conducting NASA’s first spacewalk in over a year. The pair are scheduled to spend roughly 6.5 hours in the vacuum of space, where they will work on a number of long overdue external repairs and equipment assessments.

NASA astronaut Sunni Williams, one-half Boeing Starliner crew who have been stuck on the International Space Station for months, took part in a spacewalk on Thursday to do some repairs to the orbiting laboratory.

Suni Williams, one of two astronauts who has been stuck on the International Space Station after a technical issue delayed a planned return to Earth, was performing outdoor repair work on Thursday along with astronaut Nick Hague.

NASA astronauts at the ISS go on a spacewalk to work on some upgrades at the site::Nick Hague and Suni Williams took in views of Earth as they undertook their work. The spacewalk is expected to go for about six hours.