The only way it’s happening is brain-computer interfaces that make people hallucinate the floating display, but I don’t think we should wait underwater for that either.
Man, I gotta push up my glasses here for a second. GotG happens in another galaxy where the Power Stone was found. The Soul Stone was in some other galaxy. The Space Stone ended up on Earth because Odin put it there. The Reality Stone was on some other planet that Jane found through a dimension portal (again, Odin). Loki brought the Mind Stone to Earth to get the Space Stone. We don’t know how the Time Stone ended up on Earth, but it wouldn’t surprise me if Odin was involved again.
Hundred of gazillions of trillions of planets? In five years? Makes Superman loook like a lazy schoolkid, in terms of super powers. 
Not that I’m doubting you…but this goes to the trope. Space is much bigger than Marvel seems to realize. I never realized the MCU encompassed different galaxies, too. That makes it even worse, unless they are saying there’s only like one intelligent species per gala\xy. That would explin things…
There are not words to describe how much I love this
Though at least some of the major alien races in Marvel (the Kree, Skrulls, and Shi’ar, for example) are each assigned a particular galaxy (for example, the Kree are in the Large Magellanic Cloud, and the Skrulls are in the Andromeda galaxy), it’s always been depicted that there are many many intelligent races in all of those places, even if there’s one dominant galaxy-spanning empire in each of them.
For all that The Time Machine (2002) was a terrible movie, it does deserve credit for getting the holograms right: The holographic librarian was only ever seen through a pane of glass, as though looking through a window at him, and looking around the window showed merely blank space.
Of course, holograms of that level of quality and detail, with full-motion animation, are far beyond us, but the fundamental principle was correct.
The problem is less with keeping it in one piece than it is with the energy requirements. In their universe, they’ve spun Ceres up to get 0.3 g acceleration at the equator. That implies a rotation rate of 0.0025 rad/s, and a solid sphere of Ceres’ approximate dimensions has a moment of inertia of 8.3e31 kg-m^2. That comes to a kinetic energy of 2.6e26 J. By way of comparison, the Sun’s power output is 3.8e26 W. If humanity in The Expanse were a Kardashev Type 2 civilization, that wouldn’t be a problem. But they probably aren’t even a Type 1, so we should be talking more like 1e17 W. It would take them decades to spin it up even using all of their available energy, and that’s assuming they can do it perfectly efficiently–which they can’t, since it’s space and they’d have to use a mass driver or something to spin it up, which wastes most of its power in the kinetic energy of the ejecta. So really it should have taken centuries.
At any rate, the fact that I have to do napkin math to prove to myself whether something will/won’t work for The Expanse is part of what makes it hard sci-fi (in my book). It almost always makes it one step past the sniff test.
Here’s a couple of them:
Advanced interstellar civilizations still fighting with swords (Star Wars, Dune, Riddick, Klingons, etc)
Advanced civilizations that use hereditary monarchies, feudalism, and other antiquated forms of government (for all their advanced technology, Wakanda still picks their ruler via “duel to the death”).
Space battles as Battle of Leyte Gulf in space - Giant carriers and battleships and assorted escort craft swarmed by tiny starfighters. Why bother? There’s no “horizon” to have to send fighters over to engage with the enemy and they are in the same “medium” (i.e. “space” as opposed to aircraft that travel an order of magnitude faster than seacraft). A space warship should just be a giant gun in space.
Yeah, remember how miserable the world was in the HBO series The Leftovers. And that was only like 2% of the population getting “raptured”.
Also, imagine the chaos of 3.8 billion people just “showing up” half a decade after the planet moved on without them.
“Yeah, no, it is good to see you, Ralphie, but ummm, I kind of got… remarried. Oh, does it really matter when? It was a Saturday… well, it was… okay, it was a week after you got dustbustered, if you must know.”
Presumably you’d hollow out most of the asteroid before spinning it up. Of course, it is the outer shell that will still have the largest portion of the moment of inertia, so your point taken, although given their inexplicably powerful high thrust “Epstein Drive” they can do it more quickly than decades (where the energy comes to power that drive remains unexplained). How you would spin it up without creating enormous stress differentials that would tear it asunder regardless of reinforcement is another question, and the utility doing so versus building smaller, more maneuverable (or at least towable) habitats would make it an unappealing exercise in any case. But compared to the science fiction tradition of spinning up planetary scale rings or having a massive swarm of satellites collecting the entire energy output of a star, spinning up a modest-sized planetoid feels trivial in comparison even if the practicalities of doing so make it problematic.
Just to be clear, I think The Expanse is a great show—very likely the best science fiction show that has been and will be made for the foreseeable future—and I appreciate the extreme effort and detail that the production goes to to make the universe of the story seem plausible and lived in, but what really makes it great are the complex characters with nuanced performances, elaborate story arcs that don’t start or end cleanly, and the willingness to have things go badly wrong for the characters and not just resolve it with a “particle of the week” solution that immediately sets everything right. That it feels reasonably plausible (to the layperson, at least) is a nice touch, but an actually technically accurate show about space travel would probably be extremely boring as it would be full of mission design reviews with giant presentation decks showing Nichols plots and arguing about stability criteria, endless training montages with astronauts complaining about out of date procedure books, and the occasional disaster because someone flipped a unit conversion or multiplied instead of dividing by a factor of 2*pi.
Rule of Cool:
Han Solo: Hokey religions and ancient weapons are no match for a good blaster at your side, kid.
Darth Vader: Hold my beer.
Stranger
Wow. I hadn’t even considered that as a problem (I was stuck on the fact that it would fly apart before the speed got anywhere that high)
This one’s got an interesting history. It got its start with Edgar Rice Burroughs’ John Carter of Mars series, which first appeared in 1912 in magazines. His hero was an ex-Confederate officer in the Old West, at a time when military officers still wore and used swords. The Barsoom of Burroughs didn’t have Ray Guns (at least not until they had appeared in other franchises – all the combatants on Mars used either black powder rifles or swords. Other “Planetary Romance” novels copied Burroughs, so they all used swords and standard guns, too. But swords were more picturesque and romantic.
Philip Francis Nowlan’s Armageddon 2419 AD stories gave us another “Planetary Romance” story with its hero Anthony Rogers, but this time set on earth in the far future. People were still using conventional weapons, but he added something that had been stirring in SF for a while – the Ray Gun. Or at least a huge, ship-based Ray Cannon. When the franchise moved into comic strips (and the hero became blue-collar “Buck” Rogers) they introduced the hand-held side-arm Ray Gun (which had, to my knowledge, only appeared once before in fiction, in A. Merritt’s “Moon Pool”, but which hadn’t caught on). With appearances in not only comic strips but soon on radio, comic books, and movie serials, Buck Rogers immensely broadened the appeal and base of science fiction. And brought with it the hand-held ray gun.
Naturally, there were imitators of the strip. There was “Brick” Bradford and, more important, there was “Flash” Gordon. “Flash” Gordon started off as an attempt to translate Burrpoughs’ John Carter to the comics page, but King Features couldn’t reach an agreement with the Burroughs people, so they created their own strip, mixing elements of John Carter and Buck Rogers. They had a powerful factor in illustrator Alex Raymond, who was a much better artist than either of the guys doing the Buck Rogers strip. So Flash Gordon became a big hit, possibly bigger than Buck Rogers. And he used the two weapons of his inspirations – the sword and the ray gun.
It didn’t make a lick of sense, of course. Both Robert Heinlein and Arthur C. Clarke poked fun at the idea in their own works. But swords definitely are pretty cool, and it was hard to escape the lingering success and flavor of Flash Gordon. I suspect that’s part of the reason that Frank Herbert’s Dune series has knife fighting in it (justified by the existence of personal force fields that prevent fast-moving objects, like bullets, from penetrating), or Heinlein’s justification of knife fighting in Starship Troopers, or Jerry Pournelle’s defense of them (“Even Captain Future will probably carry a shiv”) , or, of course, the Light Sabers of the Star Wars Universe (or, come to think of it, Larry Niven’s “Variable Swords” in his “Known Space” stories).
USAF has a dress uniform they call the “mess dress”. It’s socially equivalent to the civilian tuxedo. Here’s a grainy but official pic.
When I was in I suggested that the one thing it lacked was a sword. Which the Navy & USMC versions had, at least as an option. In keeping with aerospace practice and streamlined miniaturized modernity, my design wasn’t to be a 19th century relic like those services carried. Nope.
Instead, take the design of a Roman short sword, remake it in titanium instead of steel, add some kind of fancy carbon fiber for the grip material and scabbard or belt-hanger, and you’ve got the perfect ceremonial accoutrement.
Ridiculously over-engineered, expensive, and not too good at its actual function. But totally cool. The Air Force rejected it of course. 
George Lucas, after making THX 1138, had the idea of doing a Flash Gordon film, having loved the serials when he was a kid. He wasn’t able to get the rights, so he worked on his own story, using Flash Gordon and John Carter as inspirations…and that, of course, became Star Wars, and, I suspect, those earlier stories served as part of the inspiraton for having swords in Star Wars, as well.
Wait. Shouldn’t that have meant that of course the Air Force would have accepted it?
As God is his witness, he thought it would fly.
From the movie Patton you may remember George C Scott’s explanation of his proposed revised battle gear for his tank crews:
… and topped off by a gold football helmet. God it was beautiful!!
The Army rejected it of course.
If they’d turn down a 3-star war hero’s uniform idea, what chance did a mere Captain’s idea have? If only I’d had a pal high up in Lockheed to push the idea to USAF. Then it’d have gone somewhere.
But yes, I thought HQ would see the over-engineering, etc., as positive features not negative.
Ceres is made of ice and rock. To get 1 gee at the equator you’d need to spin it at +7000kph. The rock and ice would fall apart and be spread around the Solar System. Maybe you could spin it to get 0.03 gee; but you already get that from the intrinsic gravity of this dwarf planet.