The largest, most powerful launch vehicle ever built is meant to be a key part of SpaceX’s plans to send humans to Mars—and NASA’s plans to return astronauts to the moon, too

After back-to-back Starship upper stage failures, SpaceX on Tuesday again launched the world's most powerful rocket, but faced new problems.

Elon Musk’s space company plans to test the huge experimental vehicle on Tuesday, in its first flight after two explosions this year.