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

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

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.

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.