SpaceX's massive Starship rocket soared into its latest test flight Monday, as the US company vies to defy critics who say its technology might not be on track to deliver NASA's lunar projects and fulfill Elon Musk's 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.

In its 11th test voyage, the enormous rocket took off Monday from Space X's south Texas launch facilities just after 6:25pm local time (2325 GMT), according to a live video feed.

Its rocket booster landed in Gulf waters as planned as the Spacecraft cruised through space and began running through tests. It's set to splash into the Indian Ocean a

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