Astronauts Butch Wilmore and Suni Williams are conducting a spacewalk outside the International Space Station to swab the orbiting lab for evidence of microorganisms.

Sunita “Suni” Williams and Barry “Butch” Wilmore, who have spent an unexpected eight months on the International Space Station (ISS)—took their first spacewalk together on Thursday. “Here we go,” said Wilmore as he emerged into space,

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.