Update: Shortly after publishing, SpaceX began a much more ambitious series of tests with the Starship launch tower’s two main arms, which are designed to lift and (one day) catch Starships and Super Heavy boosters.
After lifting the arm carriage about 15m (~50 ft), several times higher than January 3rd’s far more conservative kickoff, SpaceX fired up each arm’s main hydraulic actuator and opened them about as wide as they’re able to move. Unsurprisingly, the arms’ first powered lateral movement happened very slowly, obviously telegraphing caution but probably also hinting at the start of a calibration process needed to determine their full range of motion and associate those positions with certain sensor readings or telemetry to ensure they can be safely controlled. As of midnight CST, that testing has continued well into the night.
Regardless of the purpose, substantial powered movement is a major milestone for the tower’s main arms and all but guarantees that more extensive tests and simulations are soon to come.
SpaceX has moved Starbase’s rocket-catching “chopstick” arms for the first time since they were installed on the orbital Starship pad’s ‘launch tower’ two months ago.
After a shockingly brisk three-month period of assembly, the first arm installed in late August 2021 was a lone structure designed to swing in; grab and stabilize Super Heavy with its claw; fuel and power Starship; and quickly detach and swing away from the rocket during launch. A month and a half later, SpaceX begin installing a much larger pair of more complex arms in mid-October. Unlike the Starship quick-disconnect (QD) arm, the pair of arms that followed were almost nothing like anything built as part of another rocket launch complex.
Unlike other ‘arms’ related to other rocket launch facilities, the pair SpaceX began to install on Starbase’s launch tower were colossal, measuring more than 30m (100+ ft) long and 5-10m (15-30 ft) tall. Built out of heavy-duty steel pipe and affixed to an even sturdier pair of claw-like supports that grab onto the launch tower, the combined assembly likely weighs hundreds of tons. Aside from their sheer scale, Starbase’s main tower arms are also attached to a complex system of cables and an industrial-strength ‘drawworks’ commonly used on giant oil rigs and derricks.
They also feature huge actuators that allow the two arms to open and close, revealing a bit of their purpose. While the main reason they likely exist is to provide SpaceX with an all-weather alternative to cranes for lifting, manipulating, and precisely stacking Starships and Super Heavy boosters at the launch pad, the headline – ever since Musk revealed the idea – has always been plans to use those same arms to literally catch rockets out of mid-air.
To do so, they’ll need to be able to actuate and move extremely quickly and precisely up and down the Starship launch tower, matching the velocity and autonomously determining the position of landing Super Heavy boosters (and possibly Starships) to avoid major damage or the loss of entire vehicles. While arguably an unnecessary gamble and an attempt to micro-optimize the concept of operations of a rocket that’s yet to attempt a single orbital-class launch, SpaceX’s CEO is clearly committed to the idea and – whether or not the first iteration works – has fully delivered on the first complete lift-and-catch system.
On January 3rd, 2022, after removing a large amount of scaffolding in the days prior, SpaceX briefly and slightly moved the installed arms for the first time, using the drawworks to lift the entire arm-and-carriage assembly a few meters (~6 ft) up and down the tower. Once a few minor additional steps are taken, the chopsticks could be ready for much more extensive testing, beginning with basic lift, descent, and arm actuation tests to calibrate and then proof the first-of-its-kind mechanism. Later, SpaceX will likely simulate catching rockets in a wide range of scenarios. Somewhere before, during, or after that testing, SpaceX may perform another fit test with Starship S20 and Super Heavy B4 – but this time using the arms to lift and install the stages.
News
SpaceX to debut new Dragon capsule in Axiom Space launch
Ax-4’s launch marks the debut of SpaceX’s latest Crew Dragon and pushes Axiom closer to building its own space station.
Axiom Space’s Ax-4 mission targets the International Space Station (ISS) with a new SpaceX Crew Dragon capsule.
The Axiom team will launch a new SpaceX Dragon capsule atop a Falcon 9 rocket from NASA’s Kennedy Space Center in Florida on Wednesday at 8:00 a.m. EDT (1200 GMT). The Ax-4 mission launch was initially set for Tuesday, June 10, but was delayed by one day due to expected high winds.
As Axiom Space’s fourth crewed mission to the ISS, Ax-4 marks the debut of an updated SpaceX Crew Dragon capsule. “This is the first flight for this Dragon capsule, and it’s carrying an international crew—a perfect debut. We’ve upgraded storage, propulsion components, and the seat lash design for improved reliability and reuse,” said William Gerstenmaier, SpaceX’s vice president of build and flight reliability.
Axiom Space is a Houston-based private space infrastructure company. It has been launching private astronauts to the ISS for research and training since 2022, building expertise for its future station. With NASA planning to decommission the ISS by 2030, Axiom has laid the groundwork for the Axiom Station, the world’s first commercial space station. The company has already begun construction on its ISS replacement.
The Ax-4 mission’s research, spanning biological, life, and material sciences and Earth observation, will support this ambitious goal. Contributions from 31 countries underscore the mission’s global scope. The four-person crew will launch from Launch Complex 39A, embarking on a 14-day mission to conduct approximately 60 scientific studies.
“The AX-4 crew represents the very best of international collaboration, dedication, and human potential. Over the past 10 months, these astronauts have trained with focus and determination, each of them exceeding the required thresholds to ensure mission safety, scientific rigor, and operational excellence,” said Allen Flynt, Axiom Space’s chief of mission services.
The Ax-4 mission highlights Axiom’s commitment to advancing commercial space exploration. By leveraging SpaceX’s Dragon capsule and conducting diverse scientific experiments, Axiom is paving the way for its Axiom Station. This mission not only strengthens international collaborations but also positions Axiom as a leader in the evolving landscape of private space infrastructure.
SpaceX
SpaceX Dragon to carry Axiom’s Ax-4 crew for ISS research
On June 10, Axiom’s Ax-4 mission heads to the ISS on a SpaceX Dragon capsule. It’s a historic return to space for India, Poland & Hungary.
Axiom Space’s Ax-4 mission, launched on a SpaceX Dragon spacecraft, will carry a historic international crew to the International Space Station (ISS) next Tuesday, June 10, from NASA’s Kennedy Space Center in Florida.
SpaceX’s Dragon capsule was recently photographed preparing for the Ax-4 launch. The Dragon will dock at the ISS on June 11 at approximately 12:30 p.m. ET for a 14-day mission focused on groundbreaking microgravity research.
The Ax-4 crew will be led by Commander Peggy Whitson from the United States. It includes Pilot Shubhanshu Shukla from India and mission specialists Sławosz Uznański-Wiśniewski from Poland and the European Space Agency and Tibor Kapu from Hungary. This mission marks a historic return to human spaceflight for India, Poland, and Hungary as each nation sends its first government-sponsored astronauts in over 40 years.
“With a culturally diverse crew, we are not only advancing scientific knowledge but also fostering international collaboration. Our previous missions set the stage, and with Ax-4, we ascend even higher, bringing more nations to low-Earth orbit and expanding humanity’s reach among the stars,” Whitson noted.
The Ax-4 mission’s research portfolio will be Axiom’s most extensive. It includes 60 scientific studies from 31 countries, including the U.S., India, Poland, Hungary, Saudi Arabia, Brazil, Nigeria, the UAE, and Europe. These studies will advance knowledge in human research, Earth observation, life, and biological and material sciences. Key investigations include supporting astronauts with insulin-dependent diabetes, examining microgravity’s impact on the brain, and studying cancer growth, particularly triple-negative breast cancer. Additional research will explore blood stem cells, joint health, blood flow, and astronaut readiness using wearable devices, iPhone software, and AWS Snowcone analytics.
Axiom Space’s partnerships with research organizations and academic institutions aim to deepen understanding of spaceflight’s effects on the human body, with potential applications for Earth-based healthcare. The Ax-4 mission underscores Axiom’s role in redefining access to low-Earth orbit, fostering global collaboration, and advancing microgravity research. As SpaceX’s Dragon enables this historic mission, it reinforces the company’s pivotal role in commercial spaceflight and scientific discovery.
Elon Musk
SpaceX to decommission Dragon spacecraft in response to Pres. Trump war of words with Elon Musk
Elon Musk says SpaceX will decommission Dragon as a result of President Trump’s threat to end his subsidies and government contracts.
SpaceX will decommission its Dragon spacecraft in response to the intense war of words that President Trump and CEO Elon Musk have entered on various social media platforms today.
President Trump and Musk, who was once considered a right-hand man to Trump, have entered a vicious war of words on Thursday. The issues stem from Musk’s disagreement with the “Big Beautiful Bill,” which will increase the U.S. federal deficit, the Tesla and SpaceX frontman says.
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The insults and threats have been brutal, as Trump has said he doesn’t know if he’ll respect Musk again, and Musk has even stated that the President would not have won the election in November if it were not for him.
President Trump then said later in the day that:
“The easiest way to save money in our Budget, Billions and Billions of Dollars, is to terminate Elon’s Government Subsidies and Contracts. I was always surprised that Biden didn’t do it!”
Musk’s response was simple: he will decommission the SpaceX capsule responsible for transporting crew and cargo to the International Space Station (ISS): Dragon.
🚨 Elon says Dragon will be decommissioned immediately due to President Trump’s threats to terminate SpaceX’s government contracts https://t.co/XNB0LflZIy
— TESLARATI (@Teslarati) June 5, 2025
Dragon has completed 51 missions, 46 of which have been to the ISS. It is capable of carrying up to 7 passengers to and from Earth’s orbit. It is the only spacecraft that is capable of returning vast amounts of cargo to Earth. It is also the first private spacecraft to take humans to the ISS.
The most notable mission Dragon completed is one of its most recent, as SpaceX brought NASA astronauts Butch Wilmore and Suni Williams back to Earth after being stranded at the ISS by a Boeing Starliner capsule.
SpaceX’s reluctance to participate in federally funded projects may put the government in a strange position. It will look to bring Boeing back in to take a majority of these projects, but there might be some reluctance based on the Starliner mishap with Wilmore and Williams.
SpaceX bails out Boeing and employees are reportedly ‘humiliated’
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