A launch window opens at 6:30 pm (2330 GMT) from the company's Starbase facility near a southern Texas village that recently voted to become a city, also called Starbase.
Standing 403 feet (123 meters) tall, Starship is the largest and most powerful launch vehicle ever built, and it carries Musk's hopes of making humanity a multi-planetary species.
NASA is also counting on a variant of Starship to serve as the crew lander for Artemis 3, the mission to return Americans to the Moon.
But the last two tests ended with the upper stages erupting into fiery cascades that sent debris raining down over Caribbean islands and disrupting flights -- piling more pressure onto SpaceX to get it right this time.
The company is betting that its aggressive testing approach, which helped it become the dominant force in commercial spaceflight, will once again pay off.
Still, it acknowledged in a statement that progress "won't always come in leaps."
According to the Wall Street Journal, SpaceX is shifting personnel and resources to the Starship program in a push to have the vehicle ready for a Mars mission as soon as next year.
On the bright side, SpaceX has now demonstrated three times that it can catch the Super Heavy first stage booster in the giant robotic arms of its launch tower -- a daring feat of engineering that it says is key to making the system rapidly reusable and reducing costs.
It will be reusing a Super Heavy booster for the first time on this ninth flight. As a result, it will not attempt a catch this time, opting instead for a splashdown in the Gulf of Mexico.
Similar to previous missions, the upper stage will attempt to fly halfway around the globe and splash down in the Indian Ocean.
For the first time, SpaceX will also aim to deploy a payload: mock-ups of its Starlink internet satellites, which are expected to burn up in the atmosphere.
In issuing its launch approval, the Federal Aviation Administration said it had nearly doubled the airspace closure zone to 1,600 nautical miles east of the launch site. It is coordinating with authorities in the UK, the British-controlled Turks and Caicos Islands, the Bahamas, Mexico, and Cuba.
The FAA also recently approved an increase in annual launches from five to 25 -- stating the increased frequency would not adversely impact the environment and overruling objections from conservation groups who warned the expansion could endanger sea turtles and shorebirds.
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