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SpaceX’s next Starship prototype is already closing in on its first tests

SpaceX technicians work to flip Starship SN4's last major subsection, a sign that its installation could be just a few days away. (NASASpaceflight - bocachicagal)

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Continuing a trend of massive steel rockets built in a matter of days and weeks instead of months, SpaceX’s next Starship prototype is already closing in on its first tests.

SpaceX’s newest vehicle is set to pick up where the third full-scale Starship prototype – coincidentally known as SN3 – left off after operator error lead to its premature destruction on April 3rd. Now a pile of scrap metal, that ship only made it partway through cryogenic proof testing when its upper tank – almost fully filled with chemically-neutral liquid nitrogen – toppled over and pulled the rest of the prototype with it. With (hopefully) improved test procedures, Starship SN4 is now set to carry that torch forward.

Following the late Starship SN1 and SN3 prototypes, SN4 is on track to be the third full-scale, functional Starship prototype built in a handful of weeks thanks to major factory upgrades SpaceX has completed in recent months. While the loss of any particular prototype is undoubtedly a setback each time it happens, such a high rate and (apparently) low cost of production means that no single failure should be a major disruption, allowing SpaceX to iterate incredibly quickly as it learns from a flurry of real-world tests.

On April 11th, SpaceX completed the second of either three or four total stacking milestones for Starship SN4, pushing the ship halfway (or more) towards completion. (NASASpaceflight – bocachicagal)

Like SN3, SpaceX’s next prototype will soon be fully stacked and transported down the road from the factory to a nearby launch and test facility, both situated directly on the South Texas Gulf Coast. Based on SN1 and SN3, SN4 could be just a week or so away from that transport milestone. SN3, for example, reached Starship SN4’s current state of assembly around March 20th. Eight days later, the vehicle was moved to the launch pad for its first tests.

Starship SN4 appears to be no more than a few days away from its final stacking milestone, pictured here with Starship SN3 on March 26th. (Elon Musk)

On April 12th, SpaceX technicians flipped Starship SN4’s aft-most section, doubling as a bottom dome of its liquid oxygen tank and a mounting point for three Raptor engines. Starship SN3 passed the same point around March 18th, just ten days before it was moved to the launch pad. Per SN3’s assembly schedule, it should be just 2-3 days before SpaceX wraps up Starship SN4’s engine section by adding another two rings, followed by the engine section’s integration with the rest of the rocket approximately 5-7 days from now.

Starship SN3’s thrust structure and aft dome was flipped on March 18th. (NASASpaceflight – bocachicagal)
Starship SN4’s own tweaked thrust structure and aft tank dome was flipped on April 12th. (NASASpaceflight – bocachicagal)

Based on Starship SN3’s behavior before a badly-designed test triggered the series of events that destroyed it, the ship appeared to be performing extremely well with its upper (methane) tank almost completely full of super-cool liquid nitrogen. If Starship SN4 does a similarly good job and makes it through the rest of the test that SN3 was unable to, SpaceX has three Raptors already tested and ready to go for their first triple-engine static fire ever.

At this point, those engines are simply waiting in a nearby hangar for a Starship prototype to be declared flight (or at least static fire) worthy. Even more excitingly, should both the engines and the Starship in question perform flawlessly during those tests, the first flights are expected to follow very soon after. Whether it’s able to summit that particular hurdle, Starship SN4’s current rate of production suggests that the ship will be ready to kick off testing later this month, perhaps less than three weeks after its predecessor kicked the bucket. Stay tuned!

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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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Tesla Full Self-Driving’s newest behavior is the perfect answer to aggressive cars

According to a recent video, it now appears the suite will automatically pull over if there is a tailgater on your bumper, the most ideal solution for when a driver is riding your bumper.

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Credit: Tesla

Tesla Full Self-Driving appears to have a new behavior that is the perfect answer to aggressive drivers.

According to a recent video, it now appears the suite will automatically pull over if there is a tailgater on your bumper, the most ideal solution for when a driver is riding your bumper.

With FSD’s constantly-changing Speed Profiles, it seems as if this solution could help eliminate the need to tinker with driving modes from the person in the driver’s seat. This tends to be one of my biggest complaints from FSD at times.

A video posted on X shows a Tesla on Full Self-Driving pulling over to the shoulder on windy, wet roads after another car seemed to be following it quite aggressively. The car looks to have automatically sensed that the vehicle behind it was in a bit of a hurry, so FSD determined that pulling over and letting it by was the best idea:

We can see from the clip that there was no human intervention to pull over to the side, as the driver’s hands are stationary and never interfere with the turn signal stalk.

This can be used to override some of the decisions FSD makes, and is a great way to get things back on track if the semi-autonomous functionality tries to do something that is either unneeded or not included in the routing on the in-car Nav.

FSD tends to move over for faster traffic on the interstate when there are multiple lanes. On two-lane highways, it will pass slower cars using the left lane. When faster traffic is behind a Tesla on FSD, the vehicle will move back over to the right lane, the correct behavior in a scenario like this.

Perhaps one of my biggest complaints at times with Full Self-Driving, especially from version to version, is how much tinkering Tesla does with Speed Profiles. One minute, they’re suitable for driving on local roads, the next, they’re either too fast or too slow.

When they are too slow, most of us just shift up into a faster setting, but at times, even that’s not enough, see below:

There are times when it feels like it would be suitable for the car to just pull over and let the vehicle that is traveling behind pass. This, at least up until this point, it appears, was something that required human intervention.

Now, it looks like Tesla is trying to get FSD to a point where it just knows that it should probably get out of the way.

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Tesla Megapack powers $1.1B AI data center project in Brazil

By integrating Tesla’s Megapack systems, the facility will function not only as a major power consumer but also as a grid-supporting asset.

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Credit: Tesla

Tesla’s Megapack battery systems will be deployed as part of a 400MW AI data center campus in Uberlândia, Brazil. The initiative is described as one of Latin America’s largest AI infrastructure projects.

The project is being led by RT-One, which confirmed that the facility will integrate Tesla Megapack battery energy storage systems (BESS) as part of a broader industrial alliance that includes Hitachi Energy, Siemens, ABB, HIMOINSA, and Schneider Electric. The project is backed by more than R$6 billion (approximately $1.1 billion) in private capital.

According to RT-One, the data center is designed to operate on 100% renewable energy while also reinforcing regional grid stability.

“Brazil generates abundant energy, particularly from renewable sources such as solar and wind. However, high renewable penetration can create grid stability challenges,” RT-One President Fernando Palamone noted in a post on LinkedIn. “Managing this imbalance is one of the country’s growing infrastructure priorities.”

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By integrating Tesla’s Megapack systems, the facility will function not only as a major power consumer but also as a grid-supporting asset.

“The facility will be capable of absorbing excess electricity when supply is high and providing stabilization services when the grid requires additional support. This approach enhances resilience, improves reliability, and contributes to a more efficient use of renewable generation,” Palamone added.

The model mirrors approaches used in energy-intensive regions such as California and Texas, where large battery systems help manage fluctuations tied to renewable energy generation.

The RT-One President recently visited Tesla’s Megafactory in Lathrop, California, where Megapacks are produced, as part of establishing the partnership. He thanked the Tesla team, including Marcel Dall Pai, Nicholas Reale, and Sean Jones, for supporting the collaboration in his LinkedIn post.

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Starlink powers Europe’s first satellite-to-phone service with O2 partnership

The service initially supports text messaging along with apps such as WhatsApp, Facebook Messenger, Google Maps and weather tools.

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Credit: SpaceX

Starlink is now powering Europe’s first commercial satellite-to-smartphone service, as Virgin Media O2 launches a space-based mobile data offering across the UK.

The new O2 Satellite service uses Starlink’s low-Earth orbit network to connect regular smartphones in areas without terrestrial coverage, expanding O2’s reach from 89% to 95% of Britain’s landmass.

Under the rollout, compatible Samsung devices automatically connect to Starlink satellites when users move beyond traditional mobile coverage, according to Reuters.

The service initially supports text messaging along with apps such as WhatsApp, Facebook Messenger, Google Maps and weather tools. O2 is pricing the add-on at £3 per month.

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By leveraging Starlink’s satellite infrastructure, O2 can deliver connectivity in remote and rural regions without building additional ground towers. The move represents another step in Starlink’s push beyond fixed broadband and into direct-to-device mobile services.

Virgin Media O2 chief executive Lutz Schuler shared his thoughts about the Starlink partnership. “By launching O2 Satellite, we’ve become the first operator in Europe to launch a space-based mobile data service that, overnight, has brought new mobile coverage to an area around two-thirds the size of Wales for the first time,” he said.

Satellite-based mobile connectivity is gaining traction globally. In the U.S., T-Mobile has launched a similar satellite-to-cell offering. Meanwhile, Vodafone has conducted satellite video call tests through its partnership with AST SpaceMobile last year.

For Starlink, the O2 agreement highlights how its network is increasingly being integrated into national telecom systems, enabling standard smartphones to connect directly to satellites without specialized hardware.

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