SpaceX's newest version of its massive Starship, the world's largest and most powerful rocket, is now scheduled to launch its critical test flight no earlier than Thursday, May 21, at 6:30 p.m. EDT (2...

Elon Musk's SpaceX has postponed a launch of its massive Starship rocket and said it plans to make another attempt at the highly-anticipated test flight on Friday.

“For those who think this is simply another repeat test flight, the engineering changes under the rocket ‘hood’ are substantial,” Joseph Gonzalez, an associate professor of practice in aerospace engin...