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NASA is about to make its most important safety decision in nearly a generation
- russfink 2y agoCan someone spell out the consequences of a failed thruster? Eg miss the reentry cone and skip off the atmosphere into space?
- lupusreal 2y agoOr come in too steep and burn up. Or miss the target drop zone and possibly come down in the wilderness or ocean (it's meant to land on flat and level land.)
- khuey 2y agoMy understanding (which may be wrong) is that they don't really understand how it's failed at this point so it could be anything from "no thrust" to "explodes and sends debris into the ISS".
- bell-cot 2y agoThat's one possibility. Unfortunately, failure modes are not limited to "the thruster(s) shut down before the desired burn was completed". Worse case looks kinda like this, but in space: https://www.cbsnews.com/news/spacex-explosion-destroyed-crew-dragon-spacecraft-blamed-on-leaking-valve/ https://www.cbsnews.com/news/spacex-explosion-destroyed-crew...
- pavel_lishin 2y ago> miss the reentry cone and skip off the atmosphere into space? My layman understanding is that this was never an option even for the Apollo trips from the moon - the problem was that a wrong re-entry angle wouldn't slow the capsule down enough to bring it down to the surface, and it would have to orbit several more times before finally slowing down enough to return. This was a problem for two reasons: (1) the landing site would be unpredictable, and it wouldn't really do to land on the Kremlin, or in the middle of the Sahara, or in the middle of the Pacific. (2) The capsules didn't have enough supplies to keep the astronauts alive for too long, and too many orbits would mean that they'd be dead on arrival.
- kfarr 2y agoIncorrect angle also leads to higher temperatures that may exceed design capabilities during re-entry
- deeth_starr_v 2y agoIn Carrying the Fire, in pre Apollo days when they did manual burns for re-entry, this was described as a big worry (burn sending you off into space). But maybe that was mitigated
- JumpCrisscross 2y ago> Can someone spell out the consequences of a failed thruster? Eg miss the reentry cone and skip off the atmosphere into space? With no thrusters Starliner can’t orient itself during reëntry, which almost guarantees burning up. I’m not sure what the minimum number of thrusters Starliner needs to safely deörbit.
- carabiner 2y ago> deörbit Do you have this set as autocorrect or do you type the ö each time?
- riffic 2y agoisn't this a "new yorker styleguide" sort of idiosyncrasy? EDIT: "Languages such as Dutch, Afrikaans, Catalan, French, Galician, and Spanish make regular use of the diaeresis" according to wikipedia.
- lainga 2y agoOnly for repeated vowels, which deoörbit is not
- CoastalCoder 2y agoExcessive diaeresis is usually caused by a vowel problem.
- dmvdoug 2y agoExplosive diaeresis is the woooorst.
- plesner 2y agoIt's a diphthong though. Same as the difference between George (roughly dzo:rdz) and Geörge (roughly dze:ordz).
- 2y ago
- sandworm101 2y agoThere are several issues. One is that the craft doesn't properly separate from the station. If it backs away from the station, then dies, it will risk colliding with the ISS after an orbit. (Lower perigee but same apogee = collision potential.) The craft needs to back away from the station sufficiently to reenter or at least conduct a second maneuver to ensure its apogee is lower than the ISS's orbit.
- bell-cot 2y agoIf NASA decided that Butch & Suni would be flying SpaceX on their return trip, that would probably allow more aggressive testing of the Starliner's thruster systems after it departs the ISS. In theory, the ISS crew could do a spacewalk or two before departure, to get a closer look at the problematic hardware. In practice - no time to plan nor train for that, improvised-at-best tools, and all the myriad ways that a flaky NTO/hydrazine fuel system could suddenly go very wrong - I'd be really surprised if they attempted anything.
- lupusreal 2y agoThis should be an easy choice for NASA. The whole point of having different vehicles available is to make this kind of choice easy. With Dragon available, there should be no pressure to use Starliner. That this is apparently controversial shows that NASA has lost the plot.
- bell-cot 2y agoYes. But it's quite possible that NASA's deciders made the real "Sorry, Boeing!" decision a while back - and are letting things seem to drag out for the sake of appearances. (No "uninformed/rushed/secret decision", nor "anti-Boeing bias", nor whatever.)
- romwell 2y agoGiven all that we know, that system shouldn't have flown to the ISS. Sincerely hoping NASA plays it safe this time. A tragedy would have far-reaching consequences for both NASA and the US, well beyond the horrifying loss of life.
- doctorpangloss 2y ago> ...maintain a clearer future for Boeing's Starliner program, which NASA would like to become operational for regular crew rotation flights to the station. Why do people in the government bend over so deeply backwards for this shitty company?
- MBCook 2y agoWith Soyuz out of the picture, if Boeing can’t get it together aren’t they basically 100% dependent on SpaceX? And the head of SpaceX is, shall we say, not giving off strong vibes of calm consistency right now. Single sourcing is never great. The article even mentions the problem of when the astronauts got stuck in space on ISS for a very long time after Columbia. While Boeing is strategically important, some of this may simply be there are no other good options out there right now for a second source. We don’t want to depend on China. We’re not on good terms with Russia. Is there anything else available?
- pbae 2y agoWhat's the worst-case scenario they're trying to avoid from being 100% dependent on SpaceX? Perhaps it's something like the present scenario. If the vaccine is as bad as the disease, then skip the vaccine and just chance it.
- doctorpangloss 2y agoHuh? Isn't the right interpretation that they are 100% dependent on SpaceX right now, in the present scenario, but simply pretending otherwise? The facts are what they are. The reason one spaceship is better than another isn't a management or strategy problem. It is what it is. There's no decision here that changes whether or not Starliner is a shitty spaceship. It might look like it does. Is NASA management is personally going to be assembling and running the plans? One interpretation is that they will now (?). Another is that is already happening and they are sucking at it, and that is SpaceX's opportunity in a nutshell. If the government wants better spaceships, it has to occasionally buy them in politically unideal circumstances. It is that simple. Sometimes it will take longer to turn some senator's state into a manufacturing powerhouse than we will have political appetite to sustain all the failures on that journey. The fact that it's not an economic problem, that no amount of money can turn around Boeing, is bad, and that's why I am surprised. Any honest interpretation of the facts makes NASA, a bunch of civil service people, look like they are delaying the inevitable to benefit no one.
- influx 2y agoI wonder at what point the astronauts can veto NASA on this. In airplanes, the pilot in command has the last word about whether to take an aircraft into the air.
- marklar423 2y agoIt appears to me there's probably a "best of both worlds" compromise: 1. Send the astronauts home on Dragon 2. Certify Starliner for human flight if it can make it home safely (uncrewed) If the capsule can make it down, it doesn't matter if there were people in it or not, right?
- shantara 2y agoThey cannot do it at the moment, as Boeing has removed the software support for flying Starliner uncrewed from this specific craft, even though it has already completed a mission without humans onboard already. And we’ve only learned about it after Starliner was stuck docked to ISS
- CoastalCoder 2y agoIs there a mechanism for updating the Starliner software while it's docked at the ISS?
- martin_a 2y agoPut a microSD with the firmware update in the slot for the navigation system card. Then restart the system and hold down the "Play" button while restarting until the screen turns blue. System may reboot several times afterwards, when everything is done, the system will startup as usual.
- shantara 2y agoPresumably, yes. But making such major alterations to the flight software might be considered an unacceptable risk to the ISS.
- dmvdoug 2y agoYes, and in the story it talks about how that updating is what would cause the longest delays in getting Starliner off ISS if they go that route. So yes, it’s possible.
- blankx32 2y ago
- 9659 2y agoThe SpaceX vehicle may look like the safest choice. But is it? A handful of manned flights does not prove that a vehicle is 'safe'. Likewise, some anomalies in 1 flight do not prove 'unsafe'. Perhaps the knowledge of Starliner issues makes it more accurate to assess the risk. Either vehicle could lose the crew on the return. "Astronauting" is a risky business. I do not envy anyone on the decision chain.
- pie420 2y agoThis is ridiculous boeing apologism. the starliner craft is broken, and only semi-operable on it's maiden voyage. the spacex craft has flown succesfully multiple times without any incident, and they have data from multiple trips which was used to analyze and improve the flight. boeing does not have that. There is a very clear safer option, and to pretend there isn't is enlightened centrism.
- Jtsummers 2y agoOne vehicle has demonstrated it can return crew safely, the other has never done that and has exhibited problems on what should have been a demonstration flight (small issues, perhaps, but nothing as critical or questionable as they've found).
- 9659 2y agospace shuttle looked safe for the first 24 launches. not shilling for Boeing. just pointing out that space is dangerous. and a couple of successes does not make the risk go away.
- lupusreal 2y agoNobody claims that the Dragon capsule is guarantee to be perfectly safe. The claim is that given the available evidence and track records, no rational assessment of risk would rank Dragon as more risky than Starliner.
- AnimalMuppet 2y agoSome anomalies in the first half of the first flight - some of which are directly relevant to its ability to successfully conduct the second half of the first flight. No, that doesn't prove 'unsafe'. It gives reason to seriously question it, though.
- riffic 2y agowhy take the risk.
- farceSpherule 2y agoF*ck NASA and their "Starliner." Soyuz is the most reliable and most successful vehicle at this point. NASA simply does not want to use it because they will lose face.
- MBCook 2y agoYou think they should use the launch vehicle of the country in a war where we’re literally arming the other side? They would 100% use Soyuz if Russia hadn’t changed the relationship by starting a war to take over a sovereign country.
- deleted 2y ago[deleted]
- lupusreal 2y agoYou're very confused, I wonder where you're getting your "facts" from. NASA hasn't stopped flying American astronauts on Soyuz. The most recent Soyuz launched March of this year with Tracy Caldwell Dyson, an American astronaut, on board. It comes back in September, with her. Another is scheduled to launch in September, with Americans in the primary and backup crews.
- MBCook 2y agoThanks for the insult. You could have decent instead of assuming I’m some nutcase. I thought we weren’t using Soyuz anymore. I didn’t remember hearing about it and given the geopolitical situation that didn’t surprise me. I’m not a major space buff who keeps up with all the launches and schedules. I thought I knew the current situation. I guess I was wrong. A simple note that I was incorrect would have easily sufficed. I’d have thanked you for the info.
- lupusreal 2y agoThroughout this thread you're trying to intuit knowledge by projecting your own biases, instead of simply looking things up. NASA still using Soyuz is something you easily could have known, you have access Wikipedia and it takes less than a minute to pull up the list of Soyuz missions, but instead you made up some story about NASA being motivated to use Starliner by a supposed inability to use Soyuz, something you incorrectly assumed, about a topic you aren't even familiar with. It's little better than your other theory that the government is scared of relying on SpaceX because they think Elon Musk is unstable. That's your bias which you are projecting onto the government. The reality is the government is already committed to and planning more missions which require the use of SpaceX hardware. They don't care that he talks shit on twitter, the services that SpaceX provide to the government are consistently world class. As for insults, I didn't call you a malicious idiot, I said that you were confused. You were confused. That wasn't an insult.
- ngneer 2y agoIn God we trust. All others must bring data.
- goodSteveramos 2y agoFor context on cost, SpaceX only charged NASA $3.1 billion for developing the Dragon 2 manned capsule. Boeing charged NASA $6.7 billion for Starliner and has spend at least 1.6 billion more than that so far.
- bell-cot 2y agoClosely related story - https://arstechnica.com/space/2024/08/with-starliner-stuck-in-space-has-nasas-safety-culture-changed-since-columbia/ https://arstechnica.com/space/2024/08/with-starliner-stuck-i... - by a journalist who seems very well connected with NASA folks. And who seems to be dropping a fair number of "they're fly home on SpaceX" hints.