I built my own telescopes as a kid, and years later I stood at the Kennedy Space Center with my hand on ground equipment that had once held a rocket upright. I have never stopped caring about this stuff. In January 2025 I wrote a comparison of SpaceX's Starship and the Space Shuttle, because people kept asking me which was the better machine, and I answered the way an enthusiast answers.

Twenty-one months later I want to do it again, because the enthusiast had the argument right and almost every number in it wrong.

Short version up front, because I hate articles that make you scroll to the bottom for the payoff:

  1. The design argument holds. Full reusability is the right idea, and partial reusability is specifically what killed the Shuttle.
  2. The flight record has been unkind to the schedule I implied. Starship reached orbit for the first time on 28 September 2026 — twenty-five days ago, on its fourteenth flight. Eight flights in twenty-two months.
  3. Both headline cost figures in my old piece are junk, in different ways. The Shuttle's "$450 million per launch" is an undated, unsourced number NASA left sitting on its own website for at least six years. Starship's "$2 million per launch" is a target for a mature vehicle that does not exist, quoted as if it were a receipt.
  4. The real question was never thrust or tonnage. It is flight rate. The Shuttle lost that argument decisively. Starship has not won it yet.

What I got wrong, plainly

I wrote that Starship "can carry up to 100 tons of cargo into space." The largest payload it has actually flown is 26 operational Starlink V3 satellites, roughly 44 tonnes, on Flight 14.

I wrote that it was designed to "fly multiple times a day." There were five flights in 2025 and three so far in 2026, including a 221-day stand-down between October 2025 and May 2026 — the longest gap in the programme's history.

I wrote about "booking a ticket to Mars in 5 years." In May 2025 Musk put the odds of an uncrewed Starship making the late-2026 Mars window at 50-50. That window passed unused, and in February 2026 SpaceX told investors it was prioritising the Moon, with Mars pushed out five to seven years.

I wrote that Starship "will cost about $2 million per launch." SpaceX has never sold a Starship launch to an outside customer, publishes no price for one, and — I checked — discloses no Starship unit cost anywhere in its own May 2026 prospectus or its sixty-page investor roadshow deck.

And I wrote that "the winner is pretty clear." In February 2026 NASA restructured the entire Artemis campaign around Starship not being ready in time. NASA's Inspector General put it in one flat sentence in March 2026: *"SpaceX's lander will not be ready for a June 2027 lunar landing."*

I didn't do the work. I repeated the brochure. Thirty years of shipping software should have taught me exactly what a vendor's roadmap number is worth, and on a subject I actually love I forgot.

The Shuttle, on its own terms

Before Starship, the Shuttle. It deserves better than being a punchline in somebody else's pitch.

NASA's own fact sheet from February 1972 is a remarkable document to read now. It promised development for "approximately $5.5 billion"; a cost per launch of "$7.7 million with a liquid-fueled booster and $10 to $13 million with a solid-fueled booster"; "30 to 40 space missions per year"; and a reference model of "some 500 missions over a 12-year period (1979–1990)."

Delivered: 135 flights in thirty years. An average of 4.5 a year.

Here is the part that changed how I think about the programme. Humboldt Mandell, who did the Shuttle's cost estimating at NASA's Johnson Space Center, laid out the autopsy himself in a 2014 conference paper. The $10.5 million per flight assumed "traffic rate of 50+ per year," self-checkout, a totally reusable thermal protection system and long engine life. What actually happened: "traffic rates were from zero to 9 (ave 4.3 per year)" and "actual cost per flight as much as $300 million (1971 dollars)" — roughly a twenty-nine-fold overrun in constant dollars. And development? NASA committed to $5.15 billion in 1971 dollars and reported an underrun of 0.8 per cent.

So the Shuttle's development came in on budget. Operations is where the promise died, and it died of flight rate. Every economic claim ever made for the vehicle was divided by a number that never arrived.

The safety record has to be said carefully, without melodrama. The Shuttle flew with crew aboard on its very first flight, which no sane programme would do today — and NASA clearly knew it, because the first four flights carried two astronauts and ejection seats, later removed. For most of its ascent envelope there was no abort mode that would have saved anyone. Challenger in 1986 and Columbia in 2003 killed seven people each. Fourteen lives belongs in any honest comparison of design philosophies, because the Shuttle's philosophy was that the vehicle had to be right the first time with people on it.

It was also stuck in low Earth orbit, and never rapidly reusable — every orbiter came back for months of inspection rather than a refuel.

None of which makes it a bad machine. It flew 135 missions, built a space station, launched and then repaired Hubble, and remains the only reusable crewed orbiter anyone has ever operated. Its failure was not that it couldn't do the job. Its failure was that it promised to do the job fifty times a year and did it four and a half.

What twenty-one months of Starship actually settled

The flight record since my original piece, compressed:

2025 was a year of regression and then recovery. Flight 7 (16 January) caught the booster and lost the ship to a propellant leak above the engine firewall; debris fell near the Turks and Caicos and the FAA diverted aircraft. Flight 8 (6 March) caught the booster and lost the ship to what SpaceX called an "energetic event" in the aft section; Florida airports held departures. Flight 9 (27 May) was the first reflight of a flown Super Heavy — and lost both stages, with the payload door refusing to open on top of it. In between, on 18 June 2025, Ship 36 was destroyed on the test stand at Massey's before its engines ever lit; Musk's preliminary explanation was a nitrogen pressure vessel failing below its rated proof pressure. Then Flights 10 (26 August) and 11 (13 October) went cleanly: payloads deployed, an engine relit in space, ships landing within metres of their Indian Ocean targets.

2026 has been a year of transition at low cadence. On 21 November 2025 Booster 18, the first Block 3 Super Heavy, buckled and ruptured during gas-system pressure testing — no propellant aboard, no engines installed. Then the 221-day gap. Flight 12 (22 May 2026) debuted Block 3, Raptor 3 and the new Pad B: the ship succeeded, the booster was destroyed when only twenty of thirty-three engines relit for boostback. The FAA required a mishap investigation and closed it on 13 July, citing heat effects on propulsion components and erroneous engine alarm settings. Flight 13 (24 July) deployed twenty real Starlink V3 satellites, which contacted the constellation and then deliberately reentered twenty minutes later; the booster was destroyed again; but the ship survived its post-splashdown tip-over intact, was towed toward Christmas Island and delivered back to Starbase on 7 October 2026 — the first flown Starship upper stage ever to come home.

Flight 14, 28 September 2026, is the inflection point. Starship reached a real orbit, roughly 262 by 275 kilometres, and deployed 26 operational Starlink V3 satellites that are in service. An engine shut down early, SpaceX initially said it would not commit to orbit and then reversed after evaluating the vehicle, and the mission was cut from about ten hours to three. The ship tipped over on splashdown and burned; no recovery was planned.

Now the uncomfortable list. As of today there has never been a Starship ship catch — the first attempt is planned for Flight 15, no earlier than November 2026. No Starship upper stage has flown twice. No Block 3 booster has been reflown. There has been no ship-to-ship propellant transfer; the GAO recorded in July 2026 that "as of May 2026, SpaceX has not yet demonstrated a critical technology it is developing to store and transfer propellant while in orbit," and that demonstration has slipped from March 2025 to March 2026 to early 2027. No Starship has launched from Florida, despite the stated goal of flying from LC-39A by year's end. Nothing has gone beyond low Earth orbit.

The booster half of the argument, in fairness, is largely made. Super Heavy was caught by the tower on Flights 7 and 8 and reflown on Flights 9 and 11. That is a genuine, demonstrated capability the Shuttle never had and never pretended to.

The informed scepticism is sharper than the press coverage. In r/SpaceXLounge on 14 August 2026, u/lee1026 put it this way: "Starship development is extremely slow. Even by reusable rocket standards. On the Space Shuttle, for example, Nixon gave the go-ahead for Shuttle in 1972. STS-1 lifted off in 1981, putting a payload in orbit and safely landing. Musk had models of the BFR in 2017, on roughly the same timeline as the Shuttle." The same user, in the same thread, also made the fairest point available on the other side: "the shuttle needed to land successfully on the first try, because human crews."

The four comparisons, redone

Reusability

My original framing — the Shuttle was "reusable... sort of," Starship is "the whole deal" — gets the intent right and the tense wrong.

Today the Shuttle has the better *demonstrated* record on reusing an orbiter. Discovery flew thirty-nine times. No Starship upper stage has flown twice. The Shuttle was partially reusable in fact; Starship is fully reusable in intent. That gap will probably close, and when a caught ship is refuelled and flown again the argument is genuinely over. It just isn't over yet, and twenty-one months ago I wrote as though it already was.

There is a detail here I find quietly delightful. As u/sebaska noted in r/SpaceXLounge on 11 June 2026, Starship's heat shield "is closely based off Space Shuttle one. It's silica fibers with borosilicate glass cover as Li-2200 and Li-900 tiles were. It's manufactured in the very same factory, in fact (which SpaceX took over)." These two vehicles are less opposed than the marketing suggests. One is wearing the other's skin.

Payload

I compared 100 tonnes against 24. Both numbers deserve scrutiny.

The Shuttle's 24.4-tonne figure, which I repeated, is a trade-press number — and the source that publishes it calls it nominal, because it depends on orbital inclination. I could not find a NASA page stating it. NASA's own 1972 fact sheet says payloads "weighing up to 29,500 kilograms (65,000 pounds)."

But rated capacity is the wrong denominator anyway. NASA's own description of the programme said the Shuttle had "boosted more than 1.36 million kilograms of cargo into orbit" over roughly 110 flights by that point — about 12 tonnes a flight, half of nominal.

So the honest comparison, real against real, is roughly 44 tonnes on Starship's single orbital flight against about 12 tonnes averaged over the Shuttle's 135. Still a decisive win, considerably smaller than the one I advertised, and achieved once.

Design philosophy

This is where the comparison is most interesting and where I had it most backwards. I treated the Shuttle's compromises as failures of imagination. They were mostly failures of politics: a vehicle designed around Air Force requirements it needed for Congressional support, which had to work perfectly on its first flight because people were strapped to it. There was no path to iteration. As u/curiouslyjake wrote in r/SpaceXLounge on 14 August 2026, "I agree the shuttle wasnt simple, but its biggest challenge was really politics."

Starship's philosophy is the inverse: build cheap, fly, break it, learn, nobody aboard. It is obviously better suited to developing a reusable vehicle, and 2025 is what it looks like from the inside — three ships and one test article lost in six months, and the programme carried on.

But iteration has a bill too, and the most useful criticism of it I found came from outside the Anglophone space press. Wang Yanan, editor-in-chief of *Aerospace Knowledge*, told CCTV on 25 August 2025 that rapid iterate-and-test "has not completely failed" for a vehicle this complex, but that it drives failures and costs up sharply, and that many of the problems "could have been solved through ground subsystem tests and extensive early engineering verification." Ground verification and iterative flight have to be combined, he argued, not traded off. Read the Ship 36 and Booster 18 ground failures back against that and it is hard to dismiss.

Crew safety is also not the slam dunk I assumed. Starship has no crew abort system at all, and as u/mclumber1 observed in r/SpaceXLounge on 12 May 2026, "Starship has worse 'black zones' than the shuttle, especially if it can only abort back to the launch site" — while conceding in the same thread that "the shuttle was extremely flawed from a crew safety standpoint." Both are true. Neither vehicle solves it.

Cost — the section I owe the reader

I printed two numbers, $450 million and $2 million, and let them do all the work. Here is where they actually come from.

The Shuttle's $450 million. It is NASA's own, and that is the problem. It sat in the Kennedy Space Center's public FAQ — "The average cost to launch a Space Shuttle is about $450 million per mission" — in identical wording in archived snapshots from 2005 and from 2011. No date. No dollar year. No source. No methodology. And NASA's own word for it is *average*, even though NASA's own 2011 fact sheet says that "for Fiscal Year 2010, the average cost to prepare and launch a shuttle mission was approximately $775 million." The same fact sheet gives the programme's lifetime cost as "$113.7 billion. (Not adjusted for inflation)" — which is NASA's cleanest cost figure and almost nobody cites it.

Pielke and Byerly, writing in *Nature* in April 2011, put the programme at more than $192 billion in 2010 dollars, which is about $1.4 billion per flight across 135 flights. The $209 billion figure you see everywhere appears to originate with a Space.com list from July 2011 with no source attached. It is not NASA's.

The real accounting is in a 1993 GAO report, NSIAD-93-115, and it is devastating in the dullest possible prose. NASA's own "average cost per flight" was $413.5 million in FY1993, and "does not include any of the approximately $30.2 billion spent through 1992 to develop the shuttle." Fixed costs were "about 90 percent of the average cost per flight." And NASA's own estimate of the marginal cost of deleting a single flight was $44.4 million. GAO recommended NASA charge the Space Station programme the average rather than the marginal cost. NASA refused, GAO rejected NASA's position, and the recommendation is recorded as closed and not implemented.

So the Shuttle cost $44 million, $413 million, $450 million, $775 million or $1.4 billion per flight. All five are real numbers about the same vehicle. Which one you get depends on what you were trying to prove.

Cost per kilogram is worse, because NASA never published one. Every figure in circulation is somebody's division. Harry Jones at NASA Ames divides $1.5 billion by 27,500 kg and gets $54,500/kg. Divide $450 million by the same denominator and you get about $16,000/kg. Edgar Zapata at Kennedy, counting cargo actually delivered to the ISS with development amortised in, gets $272,000 per kg. Same vehicle. A seventeen-fold spread, and nothing changed but the question.

Zapata, who does this for a living, named the exact error I made: "using the Shuttle's maximum payload (not cargo) of about 27,500 kg to Low Earth Orbit (LEO) at 200km, then comparing against the commercial prices for ISS cargo (not payload) delivered to the actual, higher 400km ISS orbit. With errors like these such analysis are incorrect (though 'not even wrong' might also apply.)"

Starship's $2 million is from a 2019 Air Force event, where Musk gave about $900,000 of propellant and roughly $2 million "if you consider operational costs." It has no time horizon attached. The rest of the family:

  • November 2020, Musk verbatim: "marginal cost of launch will be less than $1M for more than 100 tons to orbit, so it's mostly about fixed costs divided by launches per year." Read the second clause. He is telling you the number is meaningless without a cadence.
  • February 2022, at the Starbase update: "less than $10 million per flight, all in, within two to three years." That window closed in 2025.
  • The famous $10/kg was never his. It came from a *Science* graphic he was replying to in September 2022; his own reply said "science doesn't need to cover fixed cost."
  • July 2026, his most recent: "well below $100/kg to orbit for Starship if it achieves immediate & complete reusability, with local production of liquid CH4 & O2."

And then SpaceX's own prospectus, filed in May 2026: "We believe that Starship can eventually reduce the cost to reach orbit by 99% or more relative to the historical average launch cost per kilogram according to NASA of $18,500." Ninety-nine per cent off $18,500 is about $185 a kilogram. The roadshow deck labels it "Target." SpaceX's own filing to investors is an order of magnitude *less* aggressive than the figure its enthusiasts quote — and it still contains no Starship cost per launch anywhere in it.

The detail I keep turning over: that "$18,500 according to NASA" traces to a NASA Ames paper on spacecraft life-support systems, by the same Harry Jones, in 2018. Its stated method is "dividing the total cost per flight by the maximum payload deliverable to LEO," and it is built partly on the observation that "SpaceX's Falcon 9 now advertises a cost of $62 million to launch 22,800 kg to LEO, $2,720/kg." So the NASA baseline in SpaceX's prospectus is SpaceX's own advertised price, divided by its own maximum expendable payload, laundered through a paper about recycling water and oxygen. Jones, to his credit, stated the trap outright in a 2023 paper: "the $10/kg to LEO is only the marginal cost for an additional flight without paying back any of the development cost."

One more, and it is the one that matters for the Moon. A per-launch cost is not a per-mission cost. NASA's OIG reports that an Artemis landing requires a depot plus "more than 10 Starship tankers," at "one tanker flight every 6 days," with aggregation beginning "more than 200 days prior to crew launching." NASA's own safety panel was told 22 launches in October 2026; Musk replied that the figure was 6 to 8; and NASA's own technical paper says the forthcoming transfer test "will inform the eventual number of tanker launches required." Nobody holds a fixed multiplier.

If you want one pairing to carry away: the same Falcon 9 and Dragon that come to $2,700 a kilogram by advertised-price-over-maximum-payload cost NASA about $89,000 per kilogram of cargo actually delivered, development included, in Zapata's analysis. Thirty-three times apart. The vehicle didn't change. The construction did.

This isn't a SpaceX problem, incidentally. NASA's own OIG puts SLS and Orion at "$4.1 billion per launch" and notes in the same breath that the figure "does not include any money spent either on prior development of the system." NASA's formal response was that it "does not account, track, or report costs on a per-mission basis." The agency auditing the numbers and the agency producing them cannot agree on what a launch costs.

So: anyone quoting you a cost per kilogram owes you three things. Which costs are inside it. Which payload is the denominator — rated or flown. And whether the flight rate it assumes has ever happened. Miss any one of the three and the number is decoration. Hacker News threads this year have carried the Shuttle at $700 million, $1 billion, $1.5 billion and over $2 billion per launch, every figure stated with total confidence. They were all quoting real sources.

What actually got settled: the Artemis pivot

The clearest verdict on the last twenty-one months isn't a flight. It is what NASA did about the flights.

NASA's OIG, in March 2026, found that Starship's Artemis III development had slipped "at least 2 years"; that cryogenic propellant transfer is "one of the most significant technical challenges" and the technologies "have never been done vehicle-to-vehicle"; and that SpaceX had warned NASA in autumn 2025 that it might not make June 2027. Then the sentence: *"SpaceX's lander will not be ready for a June 2027 lunar landing."*

NASA didn't wait. On 27 February 2026 Artemis III was converted from the first crewed landing into a crewed rendezvous-and-docking demonstration in low Earth orbit — explicitly modelled on Apollo 9 — with the first landing moved to Artemis IV in early 2028. The Exploration Upper Stage, the Universal Stage Adapter and Mobile Launcher 2 were cancelled outright. And today, 23 October 2026, NASA realigned both lander contracts so that, in its own words, "neither lander provider has been assigned to a specific Artemis lunar landing mission." Readiness decides who flies. NASA has obligated $6.9 billion on the Human Landing System and expects to spend $18.3 billion through fiscal 2030.

Jared Isaacman, speaking at Kennedy today, said what I think is the best line anyone has produced about either programme: "We will not delude ourselves into believing that more time, more money, and flying less will somehow make our work safer or more achievable."

Flying less is precisely what killed the Shuttle.

What I think now

The Shuttle was an engineering achievement and, judged against its own programme's standards, a disappointment. Both are true, and neither cancels the other out. Fourteen people died on it. It also flew 135 times and built a space station, which is more than any other reusable crewed vehicle has ever done, because there has never been another one.

Starship's design philosophy is right, and its entire economic case rests on a capability it has not demonstrated. It is a better machine than the Shuttle on paper and it has been to orbit once.

The scepticism that reads best to me isn't about the engineering at all. In r/SpaceXLounge in April 2026, u/pxr555 put the real numbers at "$80M – $100M" for a fully expended launch and "maybe $40M at best" for one reusing the booster, and then said the thing nobody in the hype cycle says: "Developing and testing the depot and fully and cheaply reusable tankers within the next two years or so will be a real hard thing to do. Close to impossible I'd say." That is a specific, falsifiable claim with a date on it, and it will be settled by evidence rather than argument. I like criticism that can lose.

After thirty years of shipping software I have one reliable instinct about systems: the hard part is never the demo. It is the hundredth run, unattended, when nobody is watching and the margin has to come from somewhere other than heroics. Falcon 9 is proof that SpaceX can get a vehicle to that place. Starship is not yet proof of anything except that the booster comes back.

Here is how I'd read the next twelve months, in order:

  1. Flight 15's double catch. If the ship is caught by the tower, the single largest open question in the programme closes. If it is not, note how long the next attempt takes. Watch the orbital duration too — as u/rustybeancake pointed out in r/spacex on 16 September 2026, catching a ship back at the launch site needs it to stay up "something like 10-12 hours at least," and Flight 14's mission was cut short at three.
  2. The first reflight of a recovered ship, and the turnaround time. The number to watch is days in the shed, not the catch. That is the exact metric the Shuttle failed.
  3. Ship-to-ship propellant transfer, now no earlier than early 2027. Every lunar claim hangs off it, and it has slipped twice.
  4. Whether NASA ever publishes a fixed tanker count. While the estimates run from 6 to 22, no per-mission cost for a Moon landing exists, from anybody, at any price.
  5. A launch from Florida. One flight from LC-39A would show the architecture isn't hostage to a single site in Texas.
  6. Cadence over a calendar year, not a best gap. Twelve-month totals only. Eight flights in twenty-two months is the baseline to beat.
  7. Ignore every cost-per-kilogram figure that won't name its denominator. Including mine from January 2025.

I don't regret writing the first version. I regret writing it as a verdict. The honest form of this comparison isn't "which spacecraft wins" — it is "which of these programmes can fly often enough to make reusability pay," and that question is still open after fifty years of people claiming to have answered it. The Shuttle answered it by failing. Starship has one orbital flight, a booster that comes home, and twenty-five days on the board.

I'm still an enthusiast. I'm just going to make the numbers show me their working from now on.