The latest SpaceX prototype of its Starship rocket was destroyed during a landing attempt after a clean launch on Tuesday.
The company's livestream of the flight test froze as the rocket came in to land, and thick fog around SpaceX's facility in Texas made it difficult for witnesses to see what happened.
Starship prototype Serial Number 11, or SN11, reached its target altitude of about 10 kilometers, or about 32,800 feet. The rocket is built of stainless steel, representing the early versions of the rocket unveiled in 2019. Elon Musk's company is developing Starship with the goal of launching cargo and people on missions to the moon and Mars.
The Starship prototypes stand at about 150 feet tall, or about the size of a 15-story building, and each one is powered by three Raptor rocket engines.
Musk tweeted about half an hour after the test that "at least the crater is in the right place!"
"Something significant happened shortly after landing burn start. Should know what it was once we can examine the bits later today," Musk said.
SpaceX principal integration engineer John Insprucker noted that the thick fog in the area prevented the company from showing camera views beyond those that were on the rocket itself.
"The frozen view we saw in the camera doesn't mean that were were waiting for the signal to come back; Starship 11 is not coming back. Don't wait for the landing," Insprucker said. "We do appear to have lost all the data from the vehicle and the team of course is away from the landing pad, so we'll be out there seeing what we had."
SpaceX has successfully launched four Starship prototypes on high-altitude flight tests, starting with SN8 in December, then SN9 in February, and SN10 and now SN11 in March. But, while the launches have largely gone according to plan, the landing attempts have each ended in a variety of explosions. Notably, SpaceX is the only large rocket builder that is currently attempting to land its vehicles after a launch – traditionally, large rocket boosters are discarded after launching.
Musk's goal is for Starship to be fully reusable, envisioning a rocket that is similar to a commercial aircraft and capable of launching with minor maintenance and fuel between flights. While SpaceX has only landed prototype SN10 successfully after a high-altitude flight test – although the rocket exploded a few minutes later – the company has landed previous prototypes after short flights to about 500 feet in altitude.
Musk said on Tuesday that SpaceX's next prototype, Starship SN15, will roll out to the launchpad "in a few days."
"It has hundreds of design improvements across structures, avionics/software & engine," Musk said.
Starship is one of two "Manhattan Projects" that SpaceX is simultaneously developing, with the other being its Starlink satellite internet program. Musk has previously estimated that it will cost about $5 billion to fully develop Starship, although SpaceX has not disclosed how much it has spent on the program to date. The company last month brought in $850 million in its latest capital fundraise at a $74 billion valuation.
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