Starliner co-pilot Sunita Williams is now the world's most experienced female spacewalker, moving up to No. 4 overall.

The astronauts who have been in space for an unexpectedly monthslong assignment are conducting a spacewalk. Suni Williams and Butch Wilmore are traveling outside the International Space Station to collect samples to determine whether microorganisms exist on the outside of the orbiting laboratory.

As for the spacewalk itself, if you’d like to watch along with the event, it will be livestreamed on NASA’s streaming service, NASA+. Coverage begins at 6:30 a.m. ET on Thursday, with the spacewalk itself beginning at 8 a.m. ET.

Elon Musk says Donald Trump has asked SpaceX to rescue two astronauts who have been in space for more than seven months — even though NASA has said there's a plan in place.

NASA astronauts Suni Williams and Butch Wilmore completed a spacewalk Thursday while awaiting their delayed return to Earth. Williams set a new spacewalking record for female astronauts during the mission.

NASA's two stuck astronauts are taking their first spacewalk together, exiting the International Space Station almost eight months after moving in

NASA’s two stuck astronauts took their first spacewalk together Thursday, exiting the International Space Station almost eight months after moving in. Commander Suni Williams and Butch Wilmore removed a broken antenna and wiped the station’s exterior for evidence of any microbes that might still be alive after launching from Earth and escaping through vents.

Astronauts Butch Wilmore and Suni Williams are conducting a spacewalk outside the International Space Station to remove degraded hardware and swab for microorganisms.

NASA's two stranded astronauts conducted their first spacewalk together Thursday, stepping outside the International Space Station.