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GMoromisato 12 hours ago

This is a more balanced take, in my opinion:

https://arstechnica.com/space/2026/01/nasa-chief-reviews-ori...

Camarda is an outlier. The engineers at NASA believe it is safe. The astronauts believe it is safe. Former astronaut Danny Olivas was initially skeptical of the heat shield but came around.

And note that the OP believes it is likely (maybe very likely) that the heat shield will work fine. It's hard for me to reconcile "It is likely that Artemis II will land safely" with "Artemis II is Not Safe to Fly", unless maybe getting clicks is involved.

Regardless, this is not a Challenger or Columbia situation. In both Challenger and Columbia, nobody bothered to analyze the problem because they didn't think there was a problem. That's the difference, in my opinion. NASA is taking this seriously and has analyzed the problem deeply.

They are not YOLO'ing this mission, and it's somewhat insulting that people think they are.

idlewords 12 hours ago | parent | next [-]

If you play a single round of Russian roulette with a revolver, it is likely you will not die, but it is also not safe to do that. The same idea applies here.

The foam shedding/impact problem was heavily analyzed throughout the Shuttle program, and recognized as a significant risk. Read the CAIB report for a good history.

That report also describes the groupthink dynamic at NASA that made skeptical engineers "come around" for the good of the program in the past. Calling Camarda an outlier is just a different way of stating this problem.

arppacket 12 hours ago | parent | next [-]

It looks like they did some worst case testing that was reassuring, so that it isn't Russian roulette? Any comments on that? I suppose their composite testing and temperature projections could also be wrong, and their trajectory changes might not be mitigating enough for the heat shield chunking, but that's a few different things all simultaneously being wrong for a catastrophic failure to occur.

The NASA engineers wanted to understand what would happen if large chunks of the heat shield were stripped away entirely from the composite base of Orion. So they subjected this base material to high energies for periods of 10 seconds up to 10 minutes, which is longer than the period of heating Artemis II will experience during reentry.

What they found is that, in the event of such a failure, the structure of Orion would remain solid, the crew would be safe within, and the vehicle could still land in a water-tight manner in the Pacific Ocean.

IshKebab 9 hours ago | parent | prev | next [-]

But then no spacecraft is safe to fly. We're obviously willing to accept a much higher level of risk sending humans to the moon than in other situations. I think I read somewhere at a 1 in 30 chance of them all dying was acceptable. Not too far off from Russian roulette!

tclancy 8 hours ago | parent [-]

Pro tip: you’re supposed to use a revolver.

mikkupikku 2 hours ago | parent | next [-]

Juggle five guns after loading one.

IshKebab an hour ago | parent | prev [-]

Who says I'm not?

https://www.rockislandauction.com/detail/62/1323/rare-and-un...

Grimburger 10 hours ago | parent | prev [-]

Have you bothered to ask the astronauts on board if they want to risk it?

You're getting clicks, they're going to the moon and there's a lot of people on Earth who would happily take any tradeoff for that.

tclancy 8 hours ago | parent | next [-]

Hang on, without a dog in this fight, have I asked the people who trained their whole lives to drive cool cars if this particular cool car, which they were not involved in designing or building, is safe to drive? Is that what you are asking?

ethmarks 5 hours ago | parent [-]

They asked if the astronauts "want to risk it", not if it was actually safe. Those are very different questions. The astronauts are, in fact, the world's leading experts on whether or not they personally want to risk it, so it's not entirely unreasonable to think that they could answer that question.

It just depends on whether you think that the fact that they accept the risks is reason enough to let them fly a potentially-dangerous spacecraft.

trothamel 2 hours ago | parent [-]

This is a perfect way to put it.

Artemis II is not safe, at least by the standards we apply to things. It's the third flight of a capsule, on the second flight of the rocket, and the first flight of things like the life support system.

At the end of the day, one of the reasons astronauts are respected is they understand those risks, and go into space anyway. That doesn't mean we shouldn't try to minimize risks - but at some point the risk becomes acceptable, and the cost of reducing it too great.

To paraphrase a quote from Star Trek - risk is their business.

falcor84 44 minutes ago | parent [-]

Taking a related quote from Dollhouse: "That is their business, but that is not their purpose."

InsideOutSanta 10 hours ago | parent | prev | next [-]

> there's a lot of people on Earth who would happily take any tradeoff for that

That's not reassuring, though. And it isn't just about them.

dminik 3 hours ago | parent | prev | next [-]

Have you bothered to ask the gambler if they want to risk it?

No offense to the astronauts of course, but asking people that have dreamed of this opportunity their whole life doesn't actually tell you all that much about the actual safety of the mission as a whole.

quasistasis 9 hours ago | parent | prev [-]

The astronauts are cool with it. They are basically brainwashed to rationalize exceptional trust in all of the people and components so that they are able to focus on the task at hand.

mikkupikku 7 hours ago | parent [-]

I wouldn't say brainwashed, but they're definitely aware of the political angles related to succeeding with a career at NASA and almost always agree to play ball without causing trouble for the org.

oefrha 6 hours ago | parent | prev | next [-]

That “balanced take” severely mischaracterizes dissenting expert Camarda’s attitude, so it’s not balanced at all. Its answer to “Could the NASA engineers convince Olivas and Camarda?” is a “maybe” for Camarda, which couldn’t be further from what Camarda had to say himself, which is he was more concerned after the meeting than before.

From Camarda’s own account after the meeting:

> Hold a “transparent” meeting with invited press to “vet” the Artemis II decision with one of the most public technical dissenters, me, in attendance (Jan 8th, 2026).

> Control the one-sided narrative and bombard the attendees with the Artemis Program view

> Do not allow dissenting voices to present at the meeting

> Do not even allow the IRT or the NESC to present their findings

> Rely on the attending journalists to regurgitate the party line and witness the overwhelming consensus of knowledgeable people

The whole thing is a good read https://docs.google.com/document/d/1ddi792xdfNXcBwF8qpDUxmZz...

Characterizing someone being (slightly?) more diplomatic as “maybe convinced” is shameful.

cwillu 12 hours ago | parent | prev | next [-]

"It is likely that Artemis II will land safely" and "Artemis II is Not Safe to Fly" are both compatible with the probability of a disaster on reentry being 10%.

irjustin 12 hours ago | parent | prev | next [-]

> In both Challenger and Columbia, nobody bothered to analyze the problem because they didn't think there was a problem.

Being pedantic, NASA management "ignored" engineers - because money.

That said, I 100% agree with you assuming:

> “We have full confidence in the Orion spacecraft and its heat shield, grounded in rigorous analysis and the work of exceptional engineers who followed the data throughout the process,” Isaacman said Thursday.

I only say assuming not that I don't believe Isaacman, but historically NASA managers have said publicly everything's fine when it wasn't and tried to throw the blame onto engineers.

With Challenger, engineers said no-go.

With Columbia, engineers had to explicitly state/sign "this is unsafe", which pushes the incentivisation the wrong direction.

So, I want to believe him, but historically it hasn't been so great to do so.

GMoromisato 12 hours ago | parent [-]

There were a lot of mistakes with Challenger and Columbia--I totally agree. But I don't think it was money. It's not like the NASA administrator gets a bonus when a rocket launches (unlike some CEOs, maybe).

I think the problem with both Challenger and Columbia was that there were so many possible problems (turbine blade cracks, tiles falling off, etc.) that managers and even engineers got used to off-nominal conditions. This is the "normalization of deviance" that Diane Vaughan talked about.

Is that what's going on with the Orion heat shield? I don't think so. I think NASA engineers are well aware of the risks and have done the math to convince themselves that this is safe.

irjustin 11 hours ago | parent [-]

> It's not like the NASA administrator gets a bonus when a rocket launches

It's related to funding. I mean it's always money, right?

But in Challenger's case, there was very heavy pressure to launch because of delays and the rising costs. I remember in a documentary they explicitly mentioned there was a backlog of missions and STS-51 had been delayed multiple times. To rollout/fuel, costs a LOT and challenger had been out on the pad for a while. Rollback was a material risk+cost.

For columbia, yea less about money. They ignored the requests to repoint spy sats and normalized foam strikes.

> I think NASA engineers are well aware of the risks and have done the math to convince themselves that this is safe.

And that's the way it should be. Everything has a risk value regardless if we calculate it or not. It's never 0... (maybe accidentally going faster than light is though?) We just need to agree what it is and is acceptable.

Story time - I was a young engineer at National Instruments and I remember sitting in on a meeting where they were discussing sig figs for their new high precision DMMs. Can we guarantee 6... 7 digits? 7? and they argued that back and forth. No decisions but it really stuck with me. When you're doing bleeding edge work the lines tend to get blurry.

JumpCrisscross 8 hours ago | parent | next [-]

> It's related to funding. I mean it's always money, right?

This sounds more like there is money in the room than it’s about the money. None of the decision makers personally profited from saying go. It was much more of a prestige thing.

budman1 2 hours ago | parent | prev [-]

man, if you need 7 digits, call HP.

vannevar 3 hours ago | parent | prev | next [-]

All of the controversy over the heat shield is obscuring the much bigger safety issue: Artemis has had only a single unmanned test flight. By contrast, the Saturn launch system had seven successful unmanned tests before being trusted with a crew, including two unmanned flights of the complete Saturn V stack. And even then, three astronauts were lost during ground testing of the crew capsule due to a critical design flaw. Artemis's closest modern counterpart, the SpaceX Starship, has had 11 test flights, several of which resulted in loss of the vehicle. There is no reason to believe that Artemis has a significantly higher reliability rate than Starship or Saturn V. Even without the heat shield controversy, this is the most dangerous mission NASA has launched since the first flight of the Space Shuttle.

chasd00 14 minutes ago | parent [-]

> Artemis's closest modern counterpart, the SpaceX Starship, has had 11 test flights, several of which resulted in loss of the vehicle.

I don't think you can compare the two. Starship's risks are so high failure is almost the expected outcome, it's a trial and error based process. Starship and Artemis is an apples/oranges comparison with respect to how the programs approach risk tolerance.

eqvinox 7 hours ago | parent | prev | next [-]

TFA is ridiculous with its stance. Yeah, there's this aspect of the design they can't test in their labs. It might even be an important aspect. But safety isn't a boolean "safe"/"not safe", it's a risk assessment, and I'm quite sure there are 100 (or 10000) other things they didn't test for. As long as they're taking all of this into their risk calculations… it's fine.

And if it doesn't blow up due to heat shield failure, TFA (and its references) will be forgotten.

And if it does blow up due to heat shield failure, TFA (and its references) can suddenly claim prescience, all the while this is one of thousands of factors that went into the risk assessment. If one really wanted to claim prescience, it'd need to be a ranking of a sufficient number of failure modes.

To illustrate the problem: I hereby claim they will have a "toilet failure". Now if they actually have one, I'll claim `m4d ch0pz` in rocket engineering.

(P.S.: it's a joke but toilet failures on spacecraft are actually a serious problem, if it really happens… shit needs to go somewhere…)

gus_massa an hour ago | parent [-]

> And if it doesn't blow up due to heat shield failure, TFA (and its references) will be forgotten.

The HN hivemind will remember, he's a well known user with a well known site.

Let's hope there is no accident, but after the landing there will be reports anyway. We will take a look at the report of the shield and see if it shows a problem in spite it didn't explode, and compare with the prediction in the article. He may even write another article after the fly.

For comparison, I remember the Feynman appendix. One important detail was that Nasa said the the probability of accidents was 1/100000, but he concluded that it was closer to 1/100. Nobody expect to fly a hundred Artemis missions to get a good statistic. Even if the current version explosion rate is super high like 1/10, then you can probably fry a few missions without problems if you cross your fingers hard enough.

gbgarbeb 24 minutes ago | parent | prev | next [-]

They have analyzed the problem with 1D non-coupled models that are so poorly matched to reality they would receive an F in a high school science class.

They are YOLOing it. It is insulting that clowns like yourself continue to cover for them.

NewsaHackO 6 minutes ago | parent [-]

The issue with arguments like this is that people who make the claim "it's not safe!" never feel the negative consequences when everything goes to plan. They just slink away, and then when the next event happens, they cry wolf again. When they happen to be right 2 of ~130 times, they get to say "see I told you so!" and go on speaking tours about how they figured it out but NASA wouldn't listen, say they should be considered for a leadership position in NASA etc. To the people who think they are YOLO'ing it and that disaster is inevitable, they should be willing to actually put something on the line (promising never to talk about the topic again, money, etc.) and have some skin in the game. Otherwise, such claims are worthless.

wolvoleo 10 hours ago | parent | prev | next [-]

In the space shuttle disasters the hardware had at least been used more than once. A huge lot of this one is only tried and tested on paper.

And the idea that 'if we throw this much money at it, it really must be fine' I don't buy either. Look at how that worked out for Boeing.

For all my feelings about Musk I would much rather step into a rocket that has exploded in all kinds of imaginable situations before so they know how the materials and design actually behave in real world scenarios. I do really think that is the way to go.

randomNumber7 6 hours ago | parent [-]

> For all my feelings about Musk I would much rather step into a rocket

Definitely, but we still have to figure out if Musk is such a genious or NASA is full of retards.

wolvoleo an hour ago | parent [-]

Neither is true IMO but musk just picked the right development model.

Big space never did this because the current megaproject cost plus is just what they want, a blank check.

Witn SpaceX Musk was mainly wasting his own money especially in the beginning. So it made sense. It just makes sense, it's not even a 'shortcut'.

Ps yes he did get some grants but not beefy unlimited ones.

chasd00 9 minutes ago | parent [-]

Another thing SpaceX has going for it is when their tests fail everyone just points and laughs at Musk. When a NASA launch fails the taxpayers don't want to pay for it any longer.

sgt 10 hours ago | parent | prev | next [-]

>The NASA engineers wanted to understand what would happen if large chunks of the heat shield were stripped away entirely from the composite base of Orion. So they subjected this base material to high energies for periods of 10 seconds up to 10 minutes, which is longer than the period of heating Artemis II will experience during reentry.

> What they found is that, in the event of such a failure, the structure of Orion would remain solid, the crew would be safe within, and the vehicle could still land in a water-tight manner in the Pacific Ocean.

Indeed, this is a much more balanced take. And it turns out that the OP armchair expert is assuming NASA doesn't know what they are doing or is negligent.

pie_flavor 10 hours ago | parent | next [-]

The OP links a document from former astronaut Charles Camarda, who NASA explicitly invited in to check their work, and who observed the press conference the Ars article comes from. He addresses every point in it, including that one. Just because an article is contrary to a strident opinion doesn't make it 'balanced'. It matters whether the actual facts are true or not.

https://docs.google.com/document/d/1ddi792xdfNXcBwF8qpDUxmZz...

joak 10 hours ago | parent [-]

This report from astronaut Camarda is indeed a bomb. Scaring.

Eisenstein 10 hours ago | parent | prev [-]

I mean, it isn't like there are not multiple precedents for NASA to find a surprise safety issue, talk it down, and then see it literally blow up in their faces.

NASA is an institution and the incentives align with launching despite risk in cases where the risk was completely unanticipated. The project has its own momentum that it has gathered over time as it rolls down collecting opportunity costs and people tie themselves to it. If you think an astronaut would pull out of a launch because of a 5% risk of catastrophe... well you are talking about a group of people which originated from test pilot programs post-WWII where chances of blowing up with the gear was much much higher, so even though modern astronauts don't have the same direct experience, it isn't beyond reason to assume they inherent at least a bit of that bravado.

mikkupikku 8 hours ago | parent | prev | next [-]

> In both Challenger and Columbia, nobody bothered to analyze the problem because they didn't think there was a problem.

False on both counts. Both the SRB joint design issue and the foam shedding were known, researched and dismissed very early in the shuttle program. They suspected it after STS-1 and confirmed it within a few flights.

adgjlsfhk1 12 hours ago | parent | prev | next [-]

for human spaceflight we want a lot more than "likely" (>50%). The standard is usually "extremely likely" (~1/100 to 1/1000 chance of failure)

GMoromisato 12 hours ago | parent | next [-]

Maybe. What was the probability of Loss of Crew during Apollo? There were 9 crewed missions and 1 almost killed its crew (I will omit Apollo 1 for now). I could argue that Apollo had a 1 in 20 chance of killing a crew. Indeed, that was one reason given for cancelling the program.

The first Shuttle launch probably had a 1 in 4 chance of killing its crew. It was the first launch of an extremely complicated system and they sent it with a crew of two. Can you imagine NASA doing that today?

In a news conference last week, a NASA program manager estimated the Loss of Mission chance for Artemis II at between 1 in 2 and 1 in 50. They said, historically, a new rocket has a 1 in 2 chance of failure, but they learned much from Artemis I, so it's probably better than that. [Of course, that's Loss of Mission instead of Loss of Crew.]

My guess is NASA and the astronauts are comfortable with a 1 in 100 chance of Loss of Crew.

kelnos 9 hours ago | parent | next [-]

> There were 9 crewed missions and 1 almost killed its crew (I will omit Apollo 1 for now). I could argue that Apollo had a 1 in 20 chance of killing a crew.

That's not how risk analysis works.

Let's say every Apollo mission had gone flawlessly, and no one even came close to dying. Would you then say that the risk of death for future missions would be zero? No, of course not.

rjmunro 4 hours ago | parent | next [-]

I thought I'd look this up. If you've had 9 successful attempts, assuming nothing has changed between them and no other prior knowledge about success probability, then Laplace’s Rule of Succession says the probability of the next mission being a success is about 83.3%, i.e. there is a 1 in 6 chance of failing next time.

jonahx an hour ago | parent [-]

> and no other prior knowledge about success probability

This phrase is misleading, as Laplace's Rule of Succession is equivalent to assuming a uniform Bayesian prior over all values of p. That is, before any experiments, a 50% chance of success. Depending on the situation, this may be roughly accurate or wildly wrong. You cannot appeal to this rule to resolve the situation.

falcor84 36 minutes ago | parent [-]

Well, obviously if we have a better prior, then that's better. But assuming no other knowledge, and especially if we think that other people's priors could be intentionally misleading, this rule seems to offer the best estimate.

randomNumber7 6 hours ago | parent | prev [-]

If you only look at this data it would be the most reasonable guess.

Of course one should also analyze the technical sytems involved and then it is clear that 0% failure is not reasonable.

ballooney 5 hours ago | parent [-]

Bayes rule has existed for nearly 300 years, there is no excuse for ‘only look[ing] at this data’ and that is NEVER a reasonable thing to do.

Someone 10 hours ago | parent | prev [-]

> I could argue that Apollo had a 1 in 20 chance of killing a crew.

NASA computed the chance of “landing a man on the Moon and returning him safely to Earth” as less than 1 in 20. I would think a lot more than 1 in 20 of those failures would result in killing crew members.

https://ntrs.nasa.gov/api/citations/20190002249/downloads/20...:

“Appreciating and deemphasizing risk in Apollo

Joseph Shea, the Apollo program manager, chaired the initial Apollo systems architecting team. The “calculation was made by its architecting team, assuming all elements from propulsion to rendezvous and life support were done as well or better than ever before, that 30 astronauts would be lost before 3 were returned safely to the Earth. Even to do that well, launch vehicle failure rates would have to be half those ever achieved and with untried propulsion systems.”

The high risk of the moon landing was understood by the astronauts. Apollo 11's Command Module pilot Mike Collins described it as a “fragile daisy chain of events.” Collins and Neil Armstrong, the first man to step on the moon, rated their chances of survival at 50-50.

The awareness of risk let to intense focus on reducing risk. “The only possible explanation for the astonishing success – no losses in space and on time – was that every participant at every level in every area far exceeded the norm of human capabilities.”

However, this appreciation of the risk was not considered appropriate for the public. During Apollo, NASA conducted a full Probabilistic Risk Assessment (PRA) to assess the likelihood of success in “landing a man on the Moon and returning him safely to Earth.” The PRA indicated the chance of success was “less than 5 percent.” The NASA Administrator felt that if the results were made public, “the numbers could do irreparable harm.” The PRA effort was cancelled and NASA stayed away from numerical risk assessment as a result.

irjustin 12 hours ago | parent | prev [-]

1/100 is absolutely terrible. Shuttle had 1.5% failure rate. Bonkers.

[edit]

For comparison, commercial aviation has something like 1 in 5.8m or 6x 9's of reliability.

IshKebab 9 hours ago | parent [-]

It's not terrible for space flight. Flying a rocket to the moon and commercial aviation are obviously very different things.

randomNumber7 2 hours ago | parent | prev | next [-]

> In both Challenger and Columbia, nobody bothered to analyze the problem because they didn't think there was a problem.

Problems with the O-Rings had been known and on the morning before the challenger launched the engineers begged management to delay the launch.

cryptonector 2 hours ago | parent | prev | next [-]

Absolutely not. I will not even consider the word of an organization that has repeatedly failed to learn from its past mistakes. They need to demonstrate an ability to learn first, and to do so they need to take these concerns seriously. That means no astronauts on Artemis II.

mpweiher 11 hours ago | parent | prev | next [-]

It is easy to reconcile these two statements.

The "likely" in "likely ...to land safely" and "likely to work fine" is not nearly good enough.

quasistasis 9 hours ago | parent | prev | next [-]

Camarda isnt an outlier. Lots of people left that project after the Experimental Flight Test, which was done with the honeycomb (making Avcoat truly Avcoat) in 2014. Without Avcoat, spalling was inevitable and breakoff, oh yeah.

The design change by LM, not commentedkn by Textron is like. a beehive with no honeycomb-a crystallized block of honey.

i'll take the structural support of honeycomb any day.

It's a normalization of deviance. That is what Charlie is bringing voice to. Many of us fear reprisals and even when talking to heads of, like with Columbia, we are ignored.

So, Charlie is a voice of many people, not an outlier.

cmsefton 6 hours ago | parent | prev | next [-]

Minor nitpick: OP didn't say "maybe very likely". He said "hopefully very likely". They are, in my mind, different things.

6 hours ago | parent | prev | next [-]
[deleted]
waterTanuki 11 hours ago | parent | prev | next [-]

> The engineers at NASA believe it is safe. The astronauts believe it is safe.

This take completely ignores Camarda's observations that there is a culture of fear spreading at NASA which punishes whistleblowers. I'm not saying he's 100% correct, but how can you claim such a take is truly balanced if there's a possibility one of the parties is engaging in a cover-up?

The engineers at NASA & astronauts aboard Columbia & Challenger also believed the programs were safe.

cubefox 11 hours ago | parent | prev | next [-]

> It's hard for me to reconcile "It is likely that Artemis II will land safely" with "Artemis II is Not Safe to Fly", unless maybe getting clicks is involved.

Look up the term "expected value". If pressing a button has a 10% chance of destroying Earth, it is both 1) likely that pressing it will do nothing AND 2) the case that pressing it is extremely unsafe.

trhway 12 hours ago | parent | prev | next [-]

>The engineers at NASA believe it is safe.

it doesn't matter.

https://en.wikipedia.org/wiki/Artemis_II

"It will be the second flight of the Space Launch System (SLS), the first crewed mission of the Orion spacecraft, and the first crewed mission beyond low Earth orbit since Apollo 17 in 1972."

such "second/first" were ok 60 years ago. Today the only reason for that is that the SLS isn't reusable while the cost is hyper-astronomical.

Today's tech complexity, engineering culture and overall managerial processes don't allow the first/second to succeed as a rule. Even the best - Space X - has got several failed launches back then for Falcon and now for Starship.

Of course we wish success, and it will probably succeed - just like the Russian roulette so aptly mentioned in the sibling comment.

AIorNot 10 hours ago | parent | prev | next [-]

As a former NASA guy I would trust Eric Bergers measured and detailed reporting here over that blog post that says they are all going to die

As he shows that Olivas changed his mind:

“ Olivas told me he had changed his mind, expressing appreciation and admiration for the in-depth engineering work done by the NASA team. He would now fly on Orion”

Anyway we live in an age of armchair experts in youtube (who are often very smart but quick to rush to judgment without enough context)

The article explains the situation in a more balanced and fair light

pie_flavor 10 hours ago | parent [-]

How about former NASA engineer Charles Camarda? Linked from the article: https://docs.google.com/document/d/1ddi792xdfNXcBwF8qpDUxmZz...

joak 10 hours ago | parent [-]

I agree, this report from astronaut Camarda should really alarm NASA.

antonio0720 4 hours ago | parent | prev | next [-]

[dead]

Arodex 6 hours ago | parent | prev [-]

[flagged]