SpaceX is set to attempt the next test flight of its massive Starship rocket on Monday, as concerns grow that Elon Musk has overpromised his company's ability to deliver NASA's lunar projects and fulfill his own Mars ambitions.

The US space agency plans to use the mammoth Starship -- the world's largest and most powerful rocket -- in its efforts to return astronauts to the Moon. It is also key to Musk's zealous vision to take humans to Mars.

And while its last test mission in August was chalked up as a success, that followed a series of spectacular explosions that raised eyebrows among critics that Starship might not live up to its promises -- at least not on the timeline lawmakers and the scientific community had hoped for.

The US space agency's Artemis program hopes to return humans t

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