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Two previous attempts have ended in spectacular explosions, though that's not necessarily a bad thing: The company has adopted a rapid trial-and-error approach in order to accelerate development, and the strategy has brought success in the past.
Blastoff from the company's launch site in southeast Texas is planned for 8:10 local time (1310 GMT) with weather 70 percent favorable, SpaceX said Thursday morning.
SpaceX will run a webcast on its website starting thirty minutes earlier.
When the two stages of Starship are combined, the rocket stands 397 feet (121 meters) tall -- beating the Statue of Liberty by a comfortable 90 feet.
Its Super Heavy Booster produces 16.7 million pounds (74.3 Meganewtons) of thrust, almost double that of the world's second most powerful rocket, NASA's Space Launch System (SLS) -- though the latter is now certified, while Starship is still a prototype.
Starship's third launch test in its fully stacked configuration is set to be its most ambitious yet.
Objectives include opening and closing Starship's payload door to test its ability to deliver satellites and other cargo into space.
SpaceX also aims to re-light the ship's engines in space, and perform an onboard test that will help pave the way for future Starships to refuel one another in orbit.
Starship's planned trajectory sees it achieve orbit then make a controlled splashdown in the Indian Ocean, just over an hour after launch.
SpaceX has been developing prototypes of Starship since 2018, and early tests involved short hops of just the upper stage, which is also referred to as Starship.
- Third time lucky? -
The first "integrated" test came in April 2023. SpaceX was forced to blow up Starship within a few minutes of launch, because the two stages failed to separate.
The rocket disintegrated into a ball of fire and crashed into the Gulf of Mexico, sending a dust cloud over a town several miles (kilometers) away.
The second test in November 2023 fared slightly better: The booster separated from the spaceship, but both then exploded over the ocean, in what the company euphemistically called a "rapid unscheduled disassembly."
The FAA closed a probe into the incident last month after identifying 17 corrective actions SpaceX needed to make.
SpaceX's "rapid iterative development" strategy has paid off for the company in the past: Notably its Falcon 9 rockets that have come to be workhorses for NASA and the commercial sector, its Dragon capsule that sends astronauts and cargo to the International Space Station, and its Starlink internet satellite constellation that now covers dozens of countries.
But the clock is ticking down for SpaceX to be ready for NASA's planned return of astronauts to the Moon in 2026, using a modified Starship as the lander vehicle.
Not only does SpaceX need to prove it can launch, fly and land Starship safely -- it must eventually also show it can send multiple "Starship tankers" into orbit to refuel a main Starship for its onward journey to the Moon.
Related Links
Rocket Science News at Space-Travel.Com
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