The four Artemis II astronauts will participate in countdown demonstration tests. They will practice suiting up, entering the ...

The agency first rolled the rocket out to LC-39B back in March. But after three problem-plagued attempts to fill its core stage, NASA rolled it back to the Vehicle Assembly building for more work.

Cabana, a former astronaut and director of KSC until last year, was referring to SLS' decade-long, multibillion-dollar development that has been delayed several times. But now the agency is ready to ...