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SpaceX’s Falcon Heavy to ignite all 27 Merlin engines in early morning test

Falcon Heavy ignites all 27 Merlin 1D engines for the first time prior to its inaugural launch, January 2018. (SpaceX)

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SpaceX is set to take another stab at the first integrated static fire test of Falcon Heavy Block 5 rocket, a milestone that will open the doors for its commercial launch debut just a handful of days later.

The window for the second Falcon Heavy’s static fire test will open at 10am EDT on Friday, April 5th and lasts until 7pm EDT (14:00-23:00 UTC), after which SpaceX engineers will likely spend a minimum of 24-48 hours analyzing the data produced and verifying the rocket’s health. Soon after, the rocket will be brought horizontal and rolled back into Pad 39A’s main hangar, where the payload fairing – containing the Arabsat 6A communications satellite – will be installed atop Falcon Heavy’s second stage before the rocket rolls back out to the pad for launch.

If all goes well during these relatively routine procedures, SpaceX can be expected to announce a date for Falcon Heavy’s second-ever launch, likely no sooner than 4-5 days after the static fire is completed. In other words, a flawless performance tomorrow could permit a launch date as early as April 9-10. Launching fewer than four days after completing static fire testing is rare even for Falcon 9, which has the luxury of far less complexity (and data produced) relative to Falcon Heavy, which has only flown once and is will attempt its second launch in a significantly different configuration.

Three months after Falcon Heavy’s February 2018 debut, SpaceX debuted Falcon 9 in its upgraded Block 5 configuration, featuring widespread changes to avionics, software, structures, thermal protection, and even uprated thrust for its Merlin engines. Falcon Heavy Flight 1 was comprised of Block 2 and Block 3 variants of the Falcon 9’s umbrella V1.2 Full Thrust configuration, which debuted in December 2015. Both side boosters – Block 2s – were flight-proven and had previously launched in 2016, while the rocket’s heavily modified center core was effectively a new version of Falcon 9 based on Block 3 hardware.

Falcon 9 B1046 returned to Port of Los Angeles on December 5 after the rocket's historic third launch and landing. (Pauline Acalin)
(Top) Falcon 9 B1046 – the first Block 5 booster completed – launched for the first time in May 2018. (Bottom) Almost exactly seven months later, Falcon 8 B1046 flew for the third time in a historic first for SpaceX rockets. (SpaceX/Pauline Acalin)

One of the biggest goals of Block 5 / Version 6 is ease of reusability. In principle we could re-fly Block 4 probably upwards of ten times, but with a fair amount of work between each flight. The key to Block 5 is that it’s designed to do ten or more flights with no refurbishment between each flight. Or at least no scheduled refurbishment between each flights. The only thing that needs to change is you reload propellant and fly again.

And we have
upgrades to all the avionics as well. So we have an upgraded flight computer, engine controllers, a … more advanced inertial measurement system. [Block 5 avionics are] lighter, more advanced, and also more fault-tolerant. So it can withstand a much greater array of faults than the old avionics system. [They’re] better in every way.

Block 5 has improved payload to orbit. Improved redundancy. Improved reliability. It’s really better in every way than Block 4. I’m really proud of the SpaceX team for the design.


– SpaceX CEO Elon Musk, May 2018

A different different rocket

Given just how extensive the changes made with Block 5 are, Falcon Heavy Flight 2 is drastically different than its sole predecessor, emphasized by the 13+ months SpaceX has taken to go from Flight 1 to Flight 2. Had SpaceX been able to successfully recover Falcon Heavy’s first center core (B1033) after launch, its quite likely that the company would have attempted to refly the rocket’s three landed boosters a bit sooner than April 2019, but the booster’s failed landing threw a bit of a wrench in the production plan.

After intentionally expending almost a dozen recoverable Block 3 and 4 Falcon 9 boosters in 2017 and 2018, SpaceX’s fleet of flightworthy cores had been reduced to a tiny handful. Interrupting Falcon 9 Block 5’s production ramp would have likely become a bottleneck for 2018’s launch cadence, and may well have contributed to SpaceX falling short from its planned 30 and then 24 launches last year with a still-impressive 21. Building an entirely new Falcon Heavy center core was simply not a priority as SpaceX required all production hands on deck to build enough Block 5 boosters to avoid major launch delays.

An overview of SpaceX’s Hawthorne factory floor in early 2018. (SpaceX)

As a result, SpaceX delayed the production of the first Falcon Heavy Block 5 center core by ~6 months and ~8 boosters, shipping the rocket – presumed to be B1055 – to McGregor, Texas for static fire acceptance testing in Q4 2018. The center core arrived in Florida in mid-February 2019, following both side cores and a payload fairing.

Ultimately, SpaceX is likely to conduct Falcon Heavy’s first commercial launch with about as much caution as could be observed during the unique launches of SSO-A (the first triple-reflight of a Falcon 9), Crew Dragon DM-1 (stringent NASA oversight), and GPS III SV01 (stringent USAF oversight), as well as Falcon Heavy’s original launch debut. All four missions took anywhere from one to three weeks to go from a successful static fire to launch. Falcon Heavy Flight 2 will likely be similar, although a much faster turnaround is undeniably within the realm of possibility. For Falcon 9 Block 5, SpaceX’s current record stands at three days, achieved twice in ten Block 5 launches.

Stay tuned for an official SpaceX confirmation of Falcon Heavy’s second integrated static fire, as well as new launch date.

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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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Elon Musk

Elon Musk admits he was ‘clearly wrong’ about Anthropic

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Ministério Das Comunicações, CC BY 2.0 , via Wikimedia Commons

Elon Musk posted a candid admission on his social media platform X on June 9, declaring that he had been “clearly wrong” about Anthropic. The statement marked a notable reversal from his earlier skepticism toward the AI company.

In September, Musk had written, “Winning was never in the set of possible outcomes for Anthropic,” reflecting his view at the time that the startup had lacked the foundation or even the trajectory to succeed in what is an incredibly intense race for advanced artificial intelligence.

Musk’s latest post came amid discussion of Anthropic’s reliance on external compute resources. He praised the company’s progress, stating that Anthropic is “obviously currently the leader in AI” and that “no company has released a model as good as Mythos/Fable,” with expectations of a strong follow-up in Mythos 2.

The tone shifted dramatically from dismissal to acknowledgement of superior performance.

The context of Musk’s comments added significance. Anthropic has been operating under a recent compute deal with SpaceXAI, Musk’s AI infrastructure-focused venture. The pair entered a short-term GPU lease agreement initiated in May, providing Anthropic access to critical computing power for training and deploying its frontier models.

SpaceXAI signs agreement with Anthropic for massive AI supercomputer access

Some observers had speculated that Musk could leverage this dependency to disadvantage a rival. Musk directly addressed the possibility, writing, “I would never cut them off in a way that hurt them badly, even as a competitor. That’s not my style.”

To support his commitment to ethical competition, Musk referenced concrete examples from his other companies. Tesla famously open-sourced its entire portfolio of electric vehicle patents in 2014. The move was designed to accelerate the global adoption of sustainable transportation technology rather than protect proprietary advantages.

Tesla also made its Supercharger network available to competing electric vehicle manufacturers, transforming what could have remained an exclusive charging ecosystem into a shared infrastructure that benefits the broader industry and reduces barriers for EV adoption.

Musk further pointed to SpaceX’s practices, noting that the company launches satellites for competing commercial systems “with no increase in price or use of unfair terms.” He extended the principle to his social platform, observing that “even my worst enemies attack me on this platform,” underscoring preference for open discourse over retaliation.

These examples have illustrated Musk’s long-standing philosophy that long-term technological progress is best served by open competition and infrastructure sharing rather than leveraging market power to stifle rivals. In the fast-evolving AI sector, where compute resources and model capabilities determine leadership, Musk’s stance suggests a willingness to compete on innovation and performance alone.

Musk’s admission arrives as SpaceXAI itself advances its own frontier models while maintaining business relationships across the ecosystem. By publicly correcting his earlier assessment and reaffirming principles of fair play, Musk highlights a model of competition that prioritizes advancement of the field over short-term tactical advantages.

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Investor's Corner

NASA taps SpaceX to launch the telescope that could unlock new worlds

NASA’s Roman Space Telescope heads to orbit this August aboard SpaceX’s Falcon Heavy with massive scientific ambitions.

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SpaceX is set to play a central role in one of NASA’s most anticipated science missions in years. The company’s Falcon Heavy rocket, currently the most powerful operational launch vehicle in the world, will carry the Nancy Grace Roman Space Telescope into orbit on August 30 from Kennedy Space Center in Florida. Roman is now in final preparations inside the Payload Hazardous Servicing Facility, where on June 26 technicians used a crane to lift the observatory into a specialized stand for fueling and pre-launch testing.

Roman is named after Nancy Grace Roman, NASA’s first chief of astronomy, whose career helped shape how the agency approaches space science.

NASA chose SpaceX Falcon Heavy because of Roman’s needs to reach a specific orbit far from Earth, well beyond where a standard Falcon 9 can deliver it. The Falcon Heavy, which first flew in 2018, has since become NASA’s go-to option for missions that need serious muscle without the cost and complexity of older launch systems.

Celebrating SpaceX’s Falcon Heavy Tesla Roadster launch, seven years later (Op-Ed)

Roman will carry a field of view at least 100 times wider than the Hubble Space Telescope, meaning it can photograph enormous swaths of the universe in a single shot rather than the narrow slices Hubble captures. That difference in scale is significant. While Hubble reshaped our understanding of the cosmos over 30 years, Roman is built to work faster and wider, surveying hundreds of millions of galaxies at once.

One of Roman’s most compelling capabilities is its potential to discover and photograph planets orbiting stars outside our solar system, and with enough precision to directly image planets that would otherwise be lost. That means scientists could study the atmosphere and surface characteristics of distant worlds rather than simply confirming they exist. Combined with Roman’s sweeping field of view, the telescope could detect thousands of exoplanets, and some of those planets may be in habitable zones where liquid water could exist. No telescope currently in operation has this level of power and capability. That capability alone could change what we know about other worlds, and perhaps finally answer the question: are we the only intelligent lifeforms in existence? 

What Roman actually finds once it reaches orbit is an open question, and that is exactly what makes this launch worth watching.

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Elon Musk

SpaceX’s newest logo confirms everything about what it’s become

SpaceX officially absorbed xAI under the SpaceXAI brand, completing the largest private merger in history.

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SpaceX-Ax-4-mission-iss-launch-date

SpaceX made its corporate transformation official in May 2026 when Elon Musk posted on X that xAI would cease to exist as a standalone company. “xAI will be dissolved as a separate company, so it will just be SpaceXAI, the AI products from SpaceX,” he wrote.

A new SpaceXAI logo was announced today, visually embedding the xAI letters inside the SpaceX identity, which can be seen as a deliberate design choice that signals the merger is not a partnership but a full absorption and XAi a core function of the same company. The same way Starlink is not a separate brand but a SpaceX product. The announcement closed the loop on a process that began February 2, 2026, when SpaceX acquired xAI in the largest private merger in history, valued at $1.25 trillion. SpaceX at $1 trillion and xAI at $250 billion.


The reason SpaceX bought xAI was stated plainly by Musk at the time of the deal: to build orbital data centers. SpaceX had simultaneously filed with the FCC to launch up to one million satellites designed to function as AI compute nodes in low Earth orbit, escaping what Musk described as the energy constraints limiting AI development on Earth.

xAI provided the AI software stack, with Grok, the X platform, and the Colossus supercomputer infrastructure in Memphis with over 220,000 NVIDIA GPUs, while SpaceX provided the rockets, Starlink, and the capital base to fund it. The two companies needed each other. xAI was burning $2.5 billion in losses on $250 million in revenue. SpaceX was generating an estimated $8 billion in profit on $15 billion in revenue and needed an AI narrative to command the valuation it was targeting for its IPO.

SpaceXAI just launched into your kitchen with their new app

What SpaceX has done, regardless of how the orbital AI vision ultimately plays out, is walk into a public market as something no company has been before: a rocket manufacturer, satellite internet provider, AI software company, social media platform, and supercomputer operator under one ticker. Whether that combination is worth $2 trillion depends entirely on which of those businesses you believe in most.

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