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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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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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Starlink to launch on United Airlines planes by May 15

Select United Airlines passengers will get free Starlink internet, with 200+ Mbps speeds. Early testers streamed MLB & live news with ease.

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(Credit: United Airlines)

Starlink will launch on United Airlines planes by May 15, 2025, providing select passengers with free internet inflight.

Recently, Sean Cudahy from The Points Guy tried out United Airlines’ free Starlink Wi-Fi. The airline invited a few media to try out Starlink Aviation Wi-Fi before its official launch.

According to Cudahy, connecting to Starlink was easy. All he had to do was take out his phone and connect to the Unitedwifi.com network, which took him to a landing page. Once he clicked “get started” on the landing page, it opened the United mobile app on his phone.

The United app verified Cudahy’s status as a MileagePlus member. After that, all he had to do was click on “connect,” and he was all set. Starlink’s speed was reliable and just what passengers would need on a long flight.

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“I ran a speed test, and it clocked the Wi-Fi at 217 Mbps of download speed, and 26.8 Mbps of upload speed,” noted Cudahy.

Cudahy added that connection to Starlink Wi-Fi on his other devices, like his tablet, was easier. All he had to do was scan a QR code on his phone from his tablet.

“United certainly isn’t exaggerating on the speed of the service: I was able to simultaneously watch a live news feed about the selection of a new Pope on one device, and stream a live Major League Baseball game on another,” The Points Guy noted in his review of Starlink Aviation.

United Airlines is offering Starlink services for free to MileagePlus members. Based on Cudahy’s experience, it’s best to download the United mobile app before your flight.

United Airlines expects to equip all 300 of its Embraer 175 planes with Starlink by the end of the year. It plans to install 40 regional jets with Starlink equipment every month.

Last month, the Federal Aviation Administration (FAA) approved United Airlines’ Starlink-equipped planes. United plans to roll out Starlink Wi-Fi across all its flights. It is currently working to receive FAA approval to install Starlink equipment on over 16 aircraft models.

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Ark Invest sees potential in xAI as the world adopts more AI models

Ark’s new stake in xAI bets on Musk’s future plans. Will the newly merged companies deliver the next AI breakthrough?

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Credit: x.AI

Ark Invest reinvested in X Corp in Q1 2025 through its Ark Venture Fund, which converted into a position in xAI, Elon Musk’s artificial intelligence company.

In March, xAI acquired X, intertwining the two companies’ futures. The stock merger values xAI at $80 billion and X at $33 billion. After xAI acquired X, Elon Musk noted that the combined company would unlock “immense potential.” Ark Invest believes in Musk’s vision for xAI and X Corp.

“…the deal created a new combined entity called XAI Holdings Corp., a strategic union that integrates xAI’s cutting-edge foundational models with X’s massive user base of over 600 million strong to unlock a platform that blends real-time communication with AI-enhanced discovery, truth-seeking, and personalized knowledge delivery.

“We believe this merger will be a significant catalyst for consumer AI adoption and foundational model monetization,” Ark noted.

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Musk is reportedly planning a valuation adjustment for xAI. CNBC’s David Faber noted in April that Musk hinted at a new funding round for his artificial intelligence startup during an investor call.

The merger supports Musk’s vision to transform X into an “everything app,” where people can communicate, make monetary transactions, catch up on news, and more. xAI is already working on providing financial services. It recently partnered with TWG Global and Palantir to integrate AI with financial services.

In addition, XAI Holdings also has X Money, a payment system that could rival Venmo, Zelle, and Apple Pay. X Corp. secured a Visa partnership in January and money-transmitter licenses in 42 states, including California, in September 2024.

X Money faces opposition in New York from Manhattan Democrats Assemblymember Micah Lasher and state Sen. Brad Hoylman-Sigal, who sent a letter Monday to the state’s Department of Financial Services, urging rejection of X Corp.’s money-transmitter license. The lawmakers cited Musk’s leadership as a risk to consumer data and financial infrastructure.

Ark’s investment in xAI underscores confidence in its AI-driven future, amplified by the XAI Holdings merger. As xAI leverages X’s platform to scale AI innovation, Ark’s stake positions it to benefit from a transformative shift in consumer AI and fintech, despite ongoing challenges.

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Starlink Direct to Cell to boost remote businesses in Chile

Entel teams up with Starlink Direct to Cell to power SMEs & industries in Chile’s remote regions. Remote businesses get a major tech upgrade.

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(Credit: SpaceX)

Entel will provide Starlink Direct to Cell services to businesses in Chile and Peru, boosting connectivity in underserved regions.

Entel is Chile’s leading telecommunications provider. Its strategic collaboration leverages Starlink’s Direct to Cell service by offering advanced internet solutions to small and medium-sized enterprises (SMEs) and large corporations.

The partnership targets industries like mining, agriculture, and forestry, which often face connectivity challenges in remote areas. By tapping into Starlink’s low-latency satellite constellation, Entel aims to bridge these gaps, driving innovation and competitiveness.

The collaboration with Entel follows Starlink’s April expansion in Brazil, where its internet was integrated into John Deere’s agricultural equipment. Through its mobile app, Starlink provided Brazilian farmers with live video feeds, sensor data, and real-time sharing.

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Entel’s Starlink Direct to Cell service includes value-added features such as 24/7 network monitoring, proactive management, and dedicated technical support. An observability feature will allow businesses to track real-time connectivity performance through web or mobile applications, enhancing operational efficiency.

The service’s accessibility to SMEs is a key focus. Starlink Direct to Cell is expected to empower small businesses to engage in e-commerce, improve customer communication, and expand digital operations.

Starlink’s Direct to Cell expansion into Peru underscores Entel’s regional ambitions, positioning it as a leader in Latin America’s business connectivity landscape. While details of the Peruvian rollout remain forthcoming, the move aligns with the region’s post-COVID-19 economic recovery. Reliable internet is critical for businesses to adopt cloud-based technologies and access global markets.

Starlink’s growing influence in Latin America highlights its role in transforming connectivity for underserved areas. Entel’s partnership strengthens its portfolio and helps businesses navigate a digital economy. As industries in Chile and Peru leverage Starlink’s capabilities, the collaboration could set a precedent for regional telecom providers, fostering innovation and economic growth across diverse sectors.

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