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in 1968 Stanley Kubrick and Arthur C. Clarke created 2001: A Space Odyssey.

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The interplanetary spacecraft, Discovery One, was considered scientifically feasible at the time. The design included in-orbit assembly, nuclear thermal propulsion, centrifugal synthetic gravity, artificial intelligence, suspended animation and pod-type EVA vehicles.

There was no warp drive, teleportation, photon torpedos, rubber masked biped aliens or artificial gravity.

A half century later, is there anything about Discovery One which seems outlandish? What would be done differently if an interplanetary ship was designed with present-day knowledge and technology?

Woody
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    I'm no expert, but I think I spotted a couple of issues with their shipboard AI. – Cadence Dec 03 '22 at 06:09
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    @Cadence Why, whatever do you mean, Dave? The HAL 9000 has a perfect operational record. – Woody Dec 03 '22 at 06:54
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    different but 2001/Discovery One related: What happens if you jump on a "spin ship"? and Did Kubrick take care to get the strength of artificial gravity correct in "2001: A Space Odyssey"? – uhoh Dec 03 '22 at 10:41
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    They have 11" iPad. That aged very well – Candid Moe Dec 03 '22 at 18:47
  • Was it plausible then? – ikrase Dec 03 '22 at 21:57
  • You know ... the movie has a scene where Dave (I think) was running around the circumference of the "artificial gravity" section - however, there is gravity where the pods are (see appropriate scenes) and that doesn't quite mesh with the location of the pod bay doors. – Steve Dec 03 '22 at 22:48
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    @Steve ... right. "Gravity" was only supposed to be present in the centrifuge portion, and velcro shoes use everywhere else. Hard to make zero-g for the pod bay filming. But they did convincing zero-g for the "breathing space" scene and inside the computer room. – Woody Dec 04 '22 at 01:06
  • What is the source of the picture? It's not from the film. – Organic Marble Dec 04 '22 at 14:19
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    @OrganicMarble ... https://www.deviantart.com/trekkie5000/art/Spacecraft-Discovery-91055157 – Woody Dec 04 '22 at 16:20
  • @Cadence Right about the AI issue. But I am not sure it would be done differently today. – Florian F Dec 04 '22 at 18:22
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    It was originally supposed to have huge radiator fins at the aft end, but these were removed at some point before production. A real nuclear thermal design would need those. – N. Virgo Dec 04 '22 at 22:38
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    @N.Virgo ... Clarke's description in the book had radiators sticking out the sides so the ship looked like a big dragonfly. Kubrik was concerned viewers would think the ship was designed to fly in an atmosphere so he nixed them. – Woody Dec 04 '22 at 22:42
  • Clarke also had the centrifuge portion in a different position to that in the film. It was equatorial rather than along the longitudinal axis as portrayed in the film and in common blueprints. – blobbymcblobby Dec 05 '22 at 19:13
  • @blobbymcblobby ... I can't picture how the centrifuge would have worked if it was longitudinal. It would have cut through both the bridge and the pod bay. Equatorial is the only way it could fit in the spherical hull. Do you have a link to "blueprints"? – Woody Dec 05 '22 at 19:21
  • @Woody 2nd picture on OP's post https://scifi.stackexchange.com/q/89479/140676 - that's the official placement of it according to the movie. – blobbymcblobby Dec 05 '22 at 19:31
  • From http://www.projectrho.com/public_html/rocket/deckplans.php you can see the movie placement caused quite a few issues and everyone's been trying to shoehorn the centrifuge that way since, whilst the book made more sense. – blobbymcblobby Dec 05 '22 at 19:34

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Considering that the film was made before humankind first set foot on the Moon it is a fictional technological triumph and if you create something like that it should age well. And it has aged far better than most.

But as with any film there are a number of things which were specifically included for the purpose of the plot which are simply not the way things would be done.

The pod bay is not a practical spacecraft design. Why is it necessary to rotate the pods inside the bay? why are the pods inside the ship and not docked with it? why have a design that requires such a vast airlock to be pressure cycled every time anyone wants to use a pod?

A lot of the equipment in that long thin ship might be better arranged as additional radiation protection around the central crew habitation area.

The computer room hasn't aged well.

Community
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Slarty
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    Good point about external docking for the pods. I read the long thin design was chosen to distance crew area from that big bad reactor. The ship was assembled in space so length is cheap, but mass is not. Originally the design also had huge radiators along the length. Kubrik nixed them cause they "looked like wings". – Woody Dec 03 '22 at 16:29
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    Yes you are probably right about why the long design was chosen, there is a definite logic to it, although given where they were going a human constructed reactor would be the least of their worries. Good point about radiators they would be needed, would be large and might look a bit odd so got the chop. Probably few people notice their omission but giant "wings" would have created all manner of confusion to the general public. – Slarty Dec 03 '22 at 16:47
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    Clarke's description in the book had radiators sticking out the sides so the ship looked like a big dragonfly. Kubrik was concerned viewers would think the ship was designed to fly in an atmosphere. – Woody Dec 03 '22 at 16:55
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    re: "the computer room hasn't aged well" - given space exploration still uses fairly large computer components due to radiation concerns, a large computer room seems fairly likely. – Clockwork-Muse Dec 03 '22 at 21:40
  • scratchbuilt model of dragonfly concept - http://thegreatcanadianmodelbuilderswebpage.blogspot.com/2011/09/discovery-dragonfly.html - closeup of command module concept https://pbs.twimg.com/media/DzSLT5GWwAAfbNk?format=jpg&name=large / interestingly in the book the carousel is equatorial inside the command module sphere. – blobbymcblobby Dec 04 '22 at 05:19
  • A decade or so earlier, SF comms satellites used vacuum tube (aka valve) technology, so they needed human staff to change the valves when they inevitably failed. – PM 2Ring Dec 04 '22 at 14:29
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    re: "the computer room hasn't aged well". It looks quite ok to me. Unlike Alien's Nostromo computer room. – Florian F Dec 04 '22 at 18:14
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    Is not necessary to allow an astronaut wearing a spacesuit to float around inside the computer (except for plot purposes). It should be much smaller any cooling required doesn't need that much space and air conditioned radiation protected space would be at a premium. – Slarty Dec 05 '22 at 11:50
  • @Slarty ... The spherical section of the hull is a good design for a pressure hull. But depressurizing the pod bay (big flat floor and ceiling) destroys that elegant geometry... unless the entire sphere is depressurized, which would be REALLY bad design. You're right. Pods should be docked to the outside of the hull. The script could have been made to work around that. – Woody Dec 05 '22 at 19:07
  • keeping the pods internal may have been to protect them from damage by micro meteorites during transit. I'd not have used the same design the movie did for the pod bay, but it was a plot device. Rather you'd probably have each pod built into the walls of the bay and with a blowout panel (or other form of door) that gets opened before launch. – jwenting Dec 06 '22 at 07:24
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Possibly the least plausible part of the design today is the suspended animation. While some progress has been made, long-term suspended animation of humans is still strictly science fiction.

Organic Marble
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Some skepticism about HAL9000 has been brought up by comments and other answers, but I think that creating a system like HAL9000 would be possible today (although it would look very different on a hardware level). This is because HAL is never explicitly stated to be sapient, only that it can pass Turing-test-esque testing.

Specifically, HAL9000 is shown using these capabilities:

  • speech: Reasonably easy to do. Modern speech synthesis is indistinguishable from human speech excepting edge use cases and scenarios
  • speech recognition: Doable. Modern speech recognition can live-transcribe at very high (exceeding human) accuracy, especially if "primed" on technical vocabulary that may come up
  • facial recognition: Trivial for computers
  • natural language processing: This one is a bit tricky, but modern NLP is good enough to pass Turing tests, so an AI that speaks and answers questions reasonably isn't unrealistic
  • lip reading: Lip reading AI is already better at doing so than average real people, and I suspect that a properly "primed" AI could do this with a high degree of confidence.
  • art appreciation: A bit trickier, but recent advances like Stable Diffusion not only allow an AI to create art, but also classify and grade art, identify emotions in the art, etc. (although it does not "feel" these).
  • interpreting emotional behaviors: Modern text analysis software can already (trivially) extract a general sentiment from written words, and combining this with the speech recognition and face recognition, I think we could make the AI rather decent at identifying and categorizing emotions. The AI wouldn't need to know what being "happy" means, but can definitly pot the photo of a happy person into the "happy" bin.
  • automated reasoning: This is a bit trickier because it is so nebulous, although I believe still possible to some extent. Especially a purpose-built AI, created at enormous costs for a clearly defined use case could definitely "reason" to some degree of the term.
  • spacecraft piloting: Trivial for computers
  • playing chess: Not trivial, but a mostly solved problem for computers

HAL9000 is often portrayed as being a villain and painted as evil--particularly in the movie--but in the book, it is explained this perceived "evilness" comes from conflicting orders and poor programming. The first of these orders is to relay information accurately, while the second is explicitly to lie to the crew members about the true purpose of the mission. When these two command imperatives conflict, aberrant behavior occurs, and I don't think that this is unrealistic. HAL then "decides" that it doesn't need to lie to the crew members if they are dead (which is true), so that's why it decides to get rid of them by killing them.

In my opinion, the blame for HAL's failure lies squarely on the programmers or those who configured the system that resulted in conflicting priorities and apparently not prioritizing crew being kept alive.

The big question about feasibility of creating a HAL9000-esque system is "Can the AI perform the reasoning step of 'I don't need to lie if all the crew are dead'?" and I'd give it a 50/50 shot considering today's cutting edge AI research.

All that said, I don't think such an AI is a good idea for integrating with fundamental spacecraft systems. Most, if not all, functions of a spacecraft can be programmed in a robust, deterministic fashion which can mathematically be proven to be "bug free" as piloting and operating a spacecraft is surprisingly simple for a computer compared to something like speech recognition.

I suspect the only "AI" we will see in spacecraft in the near future are discrete trained and "baked" neural models that are capable of performing extremely specific constrained tasks where perfect accuracy is not required.

CGCampbell
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Dragongeek
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    I find it interesting that many aspects of technology are closer to 1960s science fiction than to more realisitc predictions made 25 years ago. Many things that people in the 1990s would have thought impossible have in fact come to pass. – supercat Dec 05 '22 at 08:25
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A sphere is entirely the wrong shape for centrifugal gravity. In order to maximize the usable floor space, you want to have a cylindrical shape running in the same direction as the axis of rotation.

There are basically two options for how to spin a ship such as the Discovery to generate gravity. One is the one we're all familiar with: roll around its primary axis. Discovery is probably too small for this to be practical, however. Because the distance between the axis of rotation and the outer hull is so short (I would estimate probably no more than 10-20m based on the prop shown above) you would have to spin it quite quickly to generate useful amounts of gravity. High rates of rotation cause very noticeable Coriolis effects that lead to disorientation. (You can see a brief overview of the subject, and a useful calculator for speed vs. radius vs. artificial gravity output, here.)

The other option is to pitch relative to the ship's path of travel, spinning "end over end". This requires that the two lobes of the ship have roughly equal mass, but since you've put the heavy nuclear reactor at one end and the heavy life support equipment at the other, that's probably not too burdensome. And because the crew section is quite a bit further from the axis of rotation in this configuration, it's easy to generate plenty of gravity with a relatively sedate rotation speed. The issue is, the direction we're used to thinking of as "forward" becomes "down" - the nice panoramic picture window and the pod bay doors on the shooting model would be on the floor!

While using centrifugal gravity is a nod towards realism, ultimately the design of the Discovery wouldn't be very practical for it.

Cadence
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  • From Wikipedia: "The ship's carousel (12.2 meter diameter) is a spinning band of deck, mounted inside the crew compartment, using centrifugal force to simulate the effects of gravity and is the primary living and work area ... The carousel provides Moon-level gravity rotating at just over 5 rpm." – Woody Dec 03 '22 at 22:43
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    @Woody Even assuming you wanted lunar gravity in the first place (which seems doubtful to me, but the health effects of mid-level gravity does seem like an unexplored area), that would be a terrible setup. The radius is too short, so you'll have much stronger gravity at your feet than your head, and rotational speed is much too high to keep oriented. Especially if you're moving between rotating and non-rotating environments, preventing you from acclimating to either. – Cadence Dec 03 '22 at 23:50
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    Note that rotation around the long axis is not stable. The ship would start to wobble and require active corrections. Early satellites have been lost because of this. – Florian F Dec 04 '22 at 18:18
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A retractable version of the spinning ship appears in Andy Weir's Project Hail Mary book.

While ~~cruising~~ accelerating at 1.5g for almost four years the ship looked like a normal space ship. When it got to its destination the engines section is separated from the lab and crew section using a set of cables and start rotating around the center of gravity to create artificial gravity.

This thread shows some animation of how it works and the book contains some calculations about the details.

Rsf
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