A crew member’s “medical concern” foils a planned spacewalk outside the ISS

A planned spacewalk outside the International Space Station has been postponed due to a "medical concern" with one of the crew members aboard the orbital complex, NASA announced Wednesday.

The excursion was set to begin Thursday morning. Astronauts Mike Fincke and Zena Cardman planned to head outside the space station for six-and-a-half hours to prepare for the installation of new roll-out solar arrays set to arrive later this year. The arrival of the new solar arrays will be the final...