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SpaceX rolls Super Heavy booster to orbital launch mount

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For the third time in four months, SpaceX has rolled the first potentially flightworthy Super Heavy booster towards Starbase’s orbital launch mount.

Combined with a large crane – fitted with a jig solely used to lift boosters – moving to a spot just beside the booster, it’s clear that SpaceX is preparing to reinstall Super Heavy Booster 4 (B4) on the orbital launch mount. In the context of its unusual history, though, what happens next to the first more or less finished prototype of the largest rocket booster ever built is less clear.

After a shockingly quick assembly over the course of six summer weeks, Super Heavy Booster 4 rolled out of Starbase’s ‘high bay’ facility and headed to the nearby orbital launch complex, where it was installed on a custom ‘mount’ designed to support booster testing and orbital launches. It’s now clear that during that early August photo opportunity and fit test, Booster 4 was nowhere close to finished. Nor, apparently, was it anywhere close to complete one month later when it returned to the orbital pad for the second time after another few weeks of work back at the high bay.

August 6th. (SpaceX)
September 7th. (Starship Gazer)

Three months (almost 14 weeks or 100 days) after the Super Heavy prototype’s second trip to the pad, SpaceX has yet to attempt to put the booster through a single proof test. There also appears to be a significant amount of work left to finish installing external ‘aerocovers’ and a heat shield meant to enclose all 29 of its Raptor engines. In the three-year history of Starbase, there isn’t a single prototype of the roughly two-dozen SpaceX has built, tested, and even flown that’s spent even half as long as Super Heavy B4 between apparent structural completion and its first test. Perhaps the fact that Booster 4 is a first-of-its-kind pathfinder explains SpaceX’s uncharacteristic sluggishness or reluctance to actually test the rocket.

In every other instance, SpaceX’s approach to Starship development has been to move incredibly quickly, build a large number of prototypes, and rapidly test those prototypes – often resulting in catastrophic failures. Data is gathered from those failures (SN1, SN3, SN4, SN8, SN9, SN10, SN11, and half a dozen smaller test tanks serve as examples), changes are made, and then the new and improved prototypes that follow repeat the process until SpaceX arrives at a successful design.

Super Heavy B4’s circuitous path has been almost nothing like those of its predecessors. That could also be partly explained by the unavailability of a stand or facilities capable of truly proof testing a Super Heavy, which necessitates a supply of around 3200 tons (7M lb) of liquid nitrogen (LN2; for a cryogenic proof test with full tanks), another 3200 tons of a combination of liquid methane (LCH4) and oxygen (LOx), and the ability to ignite – and survive – as many as 29 to 33 Raptor engines. The suborbital stands SpaceX has used to proof Starships and even Super Heavy Booster 3 don’t even have half the storage capacity required to fully test a booster and the mounts and their surroundings would likely be catastrophically damaged or destroyed by the thrust and blast created by dozens of Raptors.

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Still, SpaceX could have theoretically put Booster 4 through a partial cryoproof and maybe fired up as many as nine Raptors at once – not a replacement for full proof testing but still plenty to ensure Super Heavy’s structural integrity and gather invaluable data on clustered Raptor performance. Instead, of course, Super Heavy B4 has sat at Starbase’s former landing zone for more than three months while teams removed engines, reinstalled engines, half-installed a full Raptor heat shield; and installed two of six or seven ‘aerocovers’ needed to protect heat exchangers, racks of pressure vessels, and hydraulic systems installed on the booster’s aft.

Booster 4’s half-finished aft as of December 11th. (NASASpaceflight – bocachicagal)
B4 rolls towards the launch mount on December 12th. (NASASpaceflight – bocachicagal)

This is all to say that from the outside looking in, Booster 4’s path towards testing and flight has been almost entirely different from that of any other Starship prototype. While still quick in comparison with other launch vehicle development programs, relative to other Starship and Super Heavy prototypes, the rate of B4 progress has been far slower – strongly implying that something is seriously wrong with the booster, that SpaceX no longer feels that partial testing is worth the effort, that finishing Booster 4 just hasn’t been a priority for several months, or some combination of the above.

What that ultimately means is that it’s almost impossible to predict what Super Heavy B4’s future holds beyond the clear evidence that SpaceX will soon reinstall to reinstall it on an orbital launch mount that’s much closer to completion than it was the last time B4 was installed. At this point, it’s just as likely that the booster’s third launch mount installation will just be another mechanical fit test, though the hope is that it will kick off full-scale pneumatic and cryogenic proof testing. It could even culminate in the static fire of some or all of its 29 Raptor engines, which have been installed for several months.

Eric Ralph is Teslarati's senior spaceflight reporter and has been covering the industry in some capacity for almost half a decade, largely spurred in 2016 by a trip to Mexico to watch Elon Musk reveal SpaceX's plans for Mars in person. Aside from spreading interest and excitement about spaceflight far and wide, his primary goal is to cover humanity's ongoing efforts to expand beyond Earth to the Moon, Mars, and elsewhere.

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Musk sets a date for Starship trip to Mars with Optimus on board

Optimus could be the first humanoid to make it to Mars, and Musk has set a date for when he thinks it’ll happen.

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Credit: SpaceX

Elon Musk has shared when he expects to take Starship to Mars for its first uncrewed mission, and he also says Tesla’s Optimus humanoid robot will be on board for the flight.

On Friday, Musk wrote on X that SpaceX’s reusable Starship rocket will take Optimus to Mars at the end of 2026, with human landings expected to commence a few years later.

“Starship departs for Mars at the end of next year, carrying Optimus,” Musk said. “If those landings go well, then human landings may start as soon as 2029, although 2031 is more likely.”

Last year, the SpaceX and Tesla head also expectations that SpaceX would be able to begin uncrewed launches in 2016, with early launches including both Optimus and a Cybertruck unit.

Musk also followed up the announcement with a post on X on Saturday morning, noting that he expects SpaceX to launch more than 90 percent of Earth’s payload mass to orbit this year. Meanwhile, he says China will make up just around 5 percent, while the rest of the world, including other parts of America, would also make up just 5 percent.

He also predicted that that number would go up even further to nearly 100 percent, once SpaceX’s reusable rocket is being launched more frequently.

“When Starship is launching at high rate, SpaceX will probably carry >99 percent of Earth’s payload mass to orbit. This is necessary to make Mars a self-sustaining civilization,” Musk added.

READ MORE ABOUT SPACEX’S STARSHIP: Texas awards SpaceX $17.3M grant to expand Bastrop tech hub

To be sure, Musk has been known to make ambitious claims about when his companies’ products would achieve certain milestones. For example, Musk predicted in 2018 that SpaceX could launch a rocket to Mars with humans aboard by 2024, though SpaceX only began testing the company’s reusable Starship in 2023.

Still, the company has been routinely testing Starship since then, and with increasing frequency, and in October, SpaceX performed the first catch of the Starship’s Super Heavy booster after liftoff to demonstrate the concept that a reusable rocket could be possible. In a launch earlier this month, SpaceX again successfully caught the Super Heavy Booster, though it lost the upper stage to a “rapid unscheduled disassembly,” effectively meaning that it had exploded in air and showered surrounding areas with rocket parts.

The explosion was the second consecutive launch in which debris from Starship reigned down, highlighting the continued importance of testing as SpaceX aims to make the rocket a viable product for reusable space travel.

On Friday, SpaceX also launched its Starliner spacecraft to the International Space Station (ISS) to rescue astronauts that have been stuck on the orbital craft, after a Boeing launch was originally intended to bring them back to Earth. While SpaceX attempted to rescue the two astronauts in September, issues with the Starliner craft’s thrusters discovered upon arrival made NASA hold off on approving the return mission.

SpaceX completes a new first with recent Falcon 9 launch

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U.S. AG Pam Bondi: Tesla Molotov attack suspect facing up to 20 years in prison

The U.S. Attorney General confirmed that a Tesla attacker, who threw Molotov cocktails at a store, is now facing up to 20 years in prison.

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The White House, Public domain, via Wikimedia Commons
President Donald J. Trump purchases a Tesla on the South Lawn, Tuesday, March 11, 2025. (Official White House Photo by Molly Riley)

It appears that an anti-Tesla activist who is suspected of throwing Molotov cocktails at one of the electric vehicle maker’s stores is now looking at a potentially long prison sentence. 

This is, at least, as per United States Attorney General Pam Bondi, who recently shared her insights in a FOX News segment.

Tesla Attacks and Trump Warning

Tesla locations and vehicles have been subjected to numerous attacks as of late, from stores being shot up to vehicles being vandalized and set on fire in suspected arson incidents. In one case, a Tesla store in Salem, Oregon, was attacked with Molotov cocktails.

President Donald Trump has issued a stern warning to people attacking Teslas, stating that he considers such actions as domestic terrorism. While addressing the issue, Trump warned that anyone caught deliberately harming Tesla will be going through “hell.”

Attorney General’s Update

During a recent FOX News segment, US Attorney General Pam Bondi reiterated that anyone targeting others over political beliefs would be caught and punished accordingly. She highlighted that investigations are underway to find out who is behind the violent actions, and she also confirmed that a Tesla attacker, who threw Molotov cocktails at a store, is now facing up to 20 years in prison.

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“If you targeted someone, if you went after someone because of their political affiliation, we will be investigating you. We will be looking at you, because that’s the weaponization, and it has to stop. For instance, look what they’re continuing to do to Elon Musk. They are targeting Tesla dealerships, the stations where you charge a Tesla. They’re vandalizing cars. I have already directed an investigation be opened to see how this is being funded. Who is behind this? 

“We have people we’re locking up on that. We have someone in jail right now from one of the dealerships. They threw a Molotov cocktail through a dealership. They’re looking at up to 20 years in prison. So, if you’re going to touch a Tesla, go to a dealership, or do anything, you better watch out, because we’re coming after you. And if you’re funding this, we’re coming after you. We’re going to find out who you are,” Bondi stated.

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SpaceX readies to rescue astronauts from International Space Station

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Credit: SpaceX

SpaceX is readying to launch the Crew-10 mission this evening, which will bring home U.S. astronauts Butch Wilmore and Suni Williams, who have been stuck on the International Space Station for nine months.

SpaceX is working alongside NASA to bring the two astronauts home, and all systems and weather conditions are looking ideal to launch the mission this evening from the Kennedy Space Center in Florida.

Boeing was originally tasked with the rescue mission.

The company sent a Starliner aircraft to the ISS in late September in an effort to bring Williams and Wilmore home. However, malfunctioning thrusters and other issues on the Starliner aircraft prevented NASA from giving the green light to the astronauts to board and come home.

SpaceX was then tasked with bringing the two home, and it appears they will be on their way shortly.

The launch was intended to occur on Wednesday, but a last-minute problem with the rocket’s ground systems forced SpaceX and NASA to delay until at least Friday. Things are looking more ideal for a launch this evening.

The launch is targeted for 7:03 p.m. ET, but another backup opportunity is available tomorrow, March 15, at 6:41 p.m.

SpaceX writes about the Dragon spacecraft that will be used for the mission:

“The Dragon spacecraft supporting this mission previously flew NASA’s Crew-3Crew-5, and Crew-7 missions to and from the space station. This will be the second flight for the first stage booster supporting this mission, which previously launched the SES 03b mPOWER-e mission. Following stage separation, Falcon 9’s first stage will land on Landing Zone 1 (LZ-1) at Cape Canaveral Space Force Station.”

The mission will not only aim to bring the two astronauts who have been stranded for nine months home, but it will also conduct new research to prepare for human exploration beyond low-Earth orbit.

If Crew-10 launches at the planned time this evening, it will dock to the ISS at 11:30 p.m. ET on Saturday night.

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