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SpaceX CEO Elon Musk says Starship could be followed by a dramatically larger rocket

SpaceX CEO Elon Musk says an 18m-wide rocket - four times as large as Starship - could eventually follow the next-gen rocket. (Teslarati)

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6 years ago

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Hinted at in a brief tweet on August 28th, SpaceX CEO Elon Musk says that SpaceX’s massive Starship and Super Heavy launch vehicle – set to be the most powerful rocket ever built upon completion – could eventually be followed by a rocket multiple times larger.

SpaceX is currently in the process of assembling the first full-fidelity prototypes of Starship, a 9m (30 ft) diameter, 55m (180 ft) tall reusable spacecraft and upper stage. Two prototypes – Mk1 and Mk2 – are simultaneously being built in Texas and Florida, respectively, while the beginnings of the first Super Heavy prototype has visibly begun to take shape at SpaceX’s Florida campus.

Once complete, Starship’s Super Heavy booster will be the single most powerful rocket booster ever built, standing at least 70m (230 ft) tall on its own and capable of producing as much as ~90,000 kN (19,600,000 lbf) of thrust with 30 250-ton-thrust and 7 200-ton-thrust Raptor engines installed. Assuming 31 throttleable 200-ton Raptors, Super Heavy’s minimum max thrust is a still record-breaking ~62,000 kN (13.7 million lbf).

In fewer words, a full Starship/Super Heavy ‘stack’ would be the tallest (~118m/390ft), heaviest (~5000 tons/11 million lbs), and most powerful rocket ever assembled.

Starship was never meant to lower SpaceX's annual launch cadence. (SpaceX)
Starship separates from its Super Heavy booster in this updated render. (SpaceX)

And yet, despite its size, orbital-class rocketry in Earth gravity will almost never fail to benefit from more thrust; more propellant; more rocket. In light of this, CEO Elon Musk says that a theoretical next- next-generation SpaceX rocket – to potentially follow some years after Starship and Super Heavy – could be a full 18m (60 ft) wide, twice the diameter of its predecessors.

Many will recollect that doubling the diameter of a circle quadruples its area. Add in a doubling of height and a theoretical Starship 2.0 would have eight times the surface area and eight times the propellant tank volume, requiring roughly eight times as much thrust and making the vehicle eight times as heavy as Starship 1.0. Assuming that Starship’s successor retains its fineness ratio (height/width), an unlikely end result but still interesting to ponder, the vehicle would measure 18m (60 ft) in diameter and a terrifying ~236m (780 ft) tall, literally more than twice as tall as Saturn V. An 18m diameter would also make it the widest rocket ever built, with Saturn V’s S-IC first stage measuring 10m wide and the Soviet Union’s N1 ‘Block A’ first stage measuring an impressive ~17m in diameter at its widest point.

If the above assumptions are correct, a very rough estimate would peg Starship 2.0’s gross (fueled) mass at a gobsmacking ~40,000 metric tons (~90 million pounds). In the unlikely event that SpaceX would use the current generation of Raptor to power such a colossal rocket, the booster would need a bare minimum of 100+ Raptors just to lift off at all. Using Saturn V’s F-1, still the most powerful single-chamber rocket engine ever built, Starship 2.0 would need a minimum of 60+ engines to lift off.

A roughly to-scale comparison of SpaceX’s Falcon 9 rockets and proposed BFR variants, including Starship (BFR 2018) and an 18m-wide rocket teased by Elon Musk. (Teslarati/SpaceX)

For the time being, Starship and Super Heavy are plenty ambitious on their own, but it’s unsurprising to hear that SpaceX CEO Elon Musk already has some thoughts on what could follow that next-generation launch vehicle in the new decade. Still, it’s worth noting that quite possibly the craziest aspect of Starship – SpaceX’s utterly non-traditional attempt at rewriting the book on rocket manufacturing – could eventually make an 18m-diameter vehicle far more practical, assuming the company proves it’s methods can be used to build reliable, high-performance rockets.

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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 reveals Cybercab battery pack and range efficiency

Tesla aims to make the Cybercab the most efficient EV available, as executives revealed in an interview this week.

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36 minutes ago

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March 17, 2025

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Two of the top Tesla executives recently spoke about the Cybercab in an interview with a longtime manufacturing industry expert, sharing details about the electric vehicle’s (EV’s) battery pack size, range, and more.

On Monday, Tesla’s VP of Vehicle Engineering Lars Moravy and Senior Design Executive Franz von Holzhausen told manufacturing industry veteran Sandy Munro that Tesla is targeting a battery pack of under 50kWh for the Cybercab, with “close to” 300 miles of real-world range. This would make the two-seater more efficient than any other EV currently in production, partially due to the two-seater’s highly-aerodynamic design.

Munro says he was expecting a battery pack ranging from 55kWh to 60 kWh, noting how much smaller Tesla is aiming to go. Before revealing the range targets, Moravy also detailed how the Cybercab’s aero wheel covers offer optimal aerodynamics to contribute to the impressive efficiency level.

“As much as Franz hates door handles, I hate the wheel-tire interaction, and this is really the best way for us to get the most aerodynamic wheel-tire we could get,” Moravy explains.

From the wheel covers to the overall design, however, von Holzhausen explains how much thought has gone into making the vehicle so efficient—even down to its shape.

“This car is actually really unique in terms of its teardrop shape,” von Holzhausen said. “It’s actually quite narrow in the rear compared to the front. Obviously, you covered the discs, but the aero efficiency is a huge factor in getting to higher range with a smaller battery pack.”

The fact that the vehicle only has two seats also contributes to some of the design choices Tesla was able to implement, as the executive continues to explain.

“Really, because it’s a two-seater we were able to really narrow the hips on this car, and when you come to the rear, you actually start to see how narrow it is, but it’s not unattractive,” he adds.

Credit: Tesla | X

READ MORE ON TESLA CYBERCAB: Tesla reveals design inspiration behind Cybercab’s gold color

Moravy reiterates that Tesla is already starting to install production equipment for the Cybercab at Gigafactory Texas, which was revealed in a shareholder’s letter in late January. He also echoes plans that Tesla is aiming for prototype builds for the Cybercab by this summer, along with a launch event around early 2026.

In recent weeks, increasing numbers of Cybercabs have also been seen testing at Giga Texas, and longtime drone pilot and factory observer Joe Tegtmeyer said that he saw as many as six driving around the site on Monday.

Last month, Moravy also alluded to plans to make the Cybercab “road-trip-capable,” going long distances with wireless charging along the way to make it completely autonomous for passengers.

Along with talking about the Cybercab’s super-efficient design, the two executives also reiterate discussions about the art deco-inspired design of the robotaxi and the larger Robovan, both of which were unveiled in an event in October. Munro and the executives also go on to sit inside the Robovan while talking a bit about its design.

You can see footage from Teslarati‘s first full ride in the Cybercab below, as captured at the “We, Robot” event in Southern California. Or, check out the full Cybercab and Robovan episode from Munro, Moravy, and von Holzhausen below that, clocking in at just under 25 minutes.

Tesla says its Cybercab wireless charging efficiency is ‘well above 90%’

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SpaceX rescue mission for stranded ISS astronauts nears end — Here’s when they’ll return home

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2 hours ago

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March 17, 2025

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Credit: SpaceX

SpaceX is ready to bring home Butch Wilmore and Suni Williams, the two astronauts that have been stranded on the International Space Station (ISS) for nine months.

Last week, SpaceX launched its Crew-10 mission, which would dock onto the ISS late Saturday night and be the two astronauts’ ride home. Now, the end is in sight, and it appears both NASA and SpaceX are planning to have the two home this week, perhaps earlier than expected.

SpaceX readies to rescue astronauts from International Space Station

The agency and the company have announced that Dragon will autonomously undock from the ISS on Tuesday at 1:05 a.m. ET and should re-enter Earth’s atmosphere and splashdown off the Florida coast about 17 hours later.

SpaceX said:

“SpaceX and NASA are targeting Tuesday, March 18 at 1:05 a.m. ET for Dragon to autonomously undock from the International Space Station. After performing a series of departure burns to move away from the space station, Dragon will conduct multiple orbit-lowering maneuvers, jettison the trunk, and re-enter Earth’s atmosphere for splashdown off the coast of Florida approximately 17 hours later the same day.”

Crew-9 astronaut Nick Hague will be alongside Williams and Wilmore on the flight home, along with Roscosmos cosmonaut Aleksandr Gorbunov. Hague and Gorbunov have been in space since Saturday, September 28.

SpaceX was tasked with bringing Wilmore and Williams home after the Boeing Starliner that sent them there was determined not to be suitable for their return.

A report from the New York Post in late August said that Boeing employees routinely made fun of SpaceX workers, only for the company to bail them out:

SpaceX bails out Boeing and employees are reportedly ‘humiliated’

Crew-10 will bring the astronauts home, ending an extensive and unscheduled stay in space.

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Tesla starts certification process for these two vehicles in India

Considering this certification, new hiring efforts, and the first location officially announced, it’s clear that Tesla is close to launching EV sales in India.

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3 hours ago

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March 17, 2025

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Credit: Andrea Conway/X

Tesla is officially preparing to make its entry into the Indian auto market, as a recent report says the company has started the certification process for two of its vehicles in the country.

In a report over the weekend citing industry sources, The Times of India said that Tesla has started the certification and homologation processes for the Model 3 and Model Y in the country, which are requirements for any automobile to be sold there. The news follows Tesla’s recent hiring spree in India, and reports saying that it has finalized a location for its first store in Mumbai, after years of delays have stopped the U.S. automaker from launching sales in the country.

Homologation tests are meant to ensure that vehicles meet roadworthiness requirements from the country’s Central Motor Vehicle Rules, along with testing things like safety and tailpipe emissions—though the later obviously won’t be a factor for Tesla’s electric vehicles (EVs).

The report says the company also submitted as many as seven other homologation applications for test vehicles in India, while an eighth was approved more recently. It’s not surprising that the Model 3 and Model Y would be the first to make it to the country, given that they’re produced at the company’s factory in Shanghai, China.

READ MORE ON TESLA INDIA: Elon Musk, President Trump share interesting dialogue regarding Tesla Gigafactory India

In addition to the Mumbai location, a report last month suggested that Tesla would be opening a second store in New Delhi, though neither of the sites are expected to include a service center at this time. The Mumbai store will be located at the Bandra Kurla Complex shopping center, while the New Delhi site is reportedly set to go in at the Aerocity Complex near the airport.

Tesla’s highly anticipated entry into the Indian automotive market, generally considered the third-largest auto market by domestic sales volume, also follows after years of disagreements about import costs. The automaker has been in discussion with India about launching auto sales in the country since 2019 or so, though Prime Minister Narendra Modi has repeatedly requested vehicle import duties as high as 100 percent.

Along with sales of its vehicles, Modi has regularly requested that Tesla launch a car factory in India, though Elon Musk has demanded that the country first lower import duties to allow the automaker to launch auto sales. It’s unclear as of yet if the launch of auto sales will reignite discussions over a potential factory, though recent discussions with Modi, Musk, and U.S. President Donald Trump suggest that it could be within the realm of possibility.

Tesla talks to top EV maker in India as it prepares to enter the market

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