NASA is conducting its first spacewalk outside the International Space Station of the year. This planned spacewalk will have two NASA astronauts conducting installations and repairs to the ISS.

Two NASA astronauts were planning to conduct a spacewalk outside the International Space Station on Thursday, but now, it appears they may be coming home early.

NASA on Wednesday delayed a scheduled spacewalk from the International Space Station (ISS) just hours before two astronauts were due exit the orbiting laboratory. The agency said in a statement that “a medical concern with a crew member that arose Wednesday afternoon” had caused the postponement.

NASA has spent the last few weeks getting ready for two spacewalks at the International Space Station (ISS), its first in eight months. But just hours before NASA astronauts Mike Fincke and Zena Cardman were due to begin the first of the two walks on Thursday,

NASA astronauts are preparing for two spacewalks to complete tasks outside the International Space Station. Here's what we know about the mission.

On Thursday, a pair of astronauts will venture outside the space station to prepare for the future installation of roll-out solar arrays that will help power its deorbit in 2030.

NASA did not identify the crew member or provide details on the medical concern, citing privacy issues in a brief blog post.