NASA’s first crewed moon mission in decades was delayed as its engineers grapple with an all-too-familiar rocket problem: hydrogen leaks. Fixing the issue is even trickier than it may seem.

Add Yahoo as a preferred source to see more of our stories on Google. The Space Launch System (SLS) rocket at Launch Pad 39B at the Kennedy Space Center in Cape Canaveral, Florida, on January 30. - ...

This is so Florida! A rocket launch will lift off near NASA, maybe amid picture-perfect beach weather. SpaceX will send ...

If all had gone according to plan, four astronauts might have been returning just this week from a history-making, 10-day slingshot trip around the moon. Instead, NASA’s engineers have been grappling ...