Sunita Williams and Barry “Butch” Wilmore, the NASA astronauts whose mission aboard the International Space Station was extended from about eight days to nine months, are finally set to come home. The return will have to wait a little longer,

NASA and SpaceX on Wednesday night scrubbed the Falcon 9 launch of a flight intended to retrieve from the International Space Station astronauts Suni Williams and Butch Wilmore, who have spent nine months in orbit.

Tense, public squabbles between SpaceX CEO Elon Musk and NASA have stirred the space industry, but behind the scenes, space science has continued business as (almost) normal.