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In WoK Kasbal brings up cymatic patterns to try to bring Jasnah to the conclusion that she should join Vorinisim. That got my father and I thinking, and if sand on a plate could vibrate and create patterns, then why wouldn't stone and rubble on an iron core be affected as well? We didn't know why the patterns were on the ground but, The cities would need to vibrate immensely to move mountains into patterns. This would destroy the cities too, and so, the cities couldn't be on the ground. On Ashyn, most people live on huge floating cities because of the great catalyst that forced humans to Roshar. Sadly at the moment, we don't know what runs these ships, but we can assume they vibrated. And thus cymatics come into play. The patterns around certain cities said to be made by the Almighty could be made by the different floating cities. But these cities were also said to be made by... The Almighty. Supposedly, using the Cognitive realm, a few floating cities could slip from Ashyn to Roshar and land, thus bringing the peoples of Ashyn to the planet of Roshar. Kolinar's Windblades, and Sesemalex Dar's patterns could be the results of the floating cities. Urithiru may be an intact floating city, as it looks like a space ship but it may not be. Post comments and thoughts below.

So we all know that Mistborn Era 4 Scadrial has become a space faring civilisation, and that in Sixth of the Dusk, there is at least one civilisation that has reached this status. Given the sheer versatility of the investiture systems, it is pretty likely that the aliens are in fact Scadrians. That opens up so many questions, but I would like to focus on one specifically: how did they do it? As mentioned before, it is Scadrials magic systems which probably made them the first space civilisation. I believe that it is a combination of Cadmium, Bendalloy, Ettmetal, and Medallions which have allowed them to enter the space frontier. Bendalloy makes speed bubbles, so if you attach one to a spaceship, the math on the wiki page says you would compress 2 minutes of the ship moving at full speed into 15 seconds of actual travel time. The problem with this is that people inside the spaceship will still age, as it is time which is being manipulated. That means that while the spaceship would travel FTL relative to the cosmere, inside the bubble, people would age normally. Essentially, it unpractical space travel and very limited. BUT, if you also create a smaller cadmium bubble around the structure of the ship ( a C.bubble within a B.bubble), we know from this WoB that the effects will cancel out: This means that the crew wouldn't be trapped inside the speed speed bubble, and so will experience time normally. However, to make this technology even more efficient, the Scadrians would put up ANOTHER cadmium bubble within the first cadmium bubble (C.bubble within C.bubble within B.bubble). This would allow them to travel FTL and not feel the time effects at all! Essentially, they would be able to get anywhere in no time. I do believe that Ettmetal will be used in the propulsion of the spacecraft, probably through some nuclear propulsion technology. This is what would take the spacecraft to such high speeds. I don't really know how to explain all the other uses, so here's @hwiles comment pulled from here: As for the medallions their benefits are endless: from breath, to healing, to warmth, to weight (which will probably be useful combined with pushing and pulling in space) and the various other technological impacts. NOTE: I just found out from the coppermind that time bubbles in fact compound if used together. This is crazy, and makes FTL travel much, much easier. A normal speed bubble speeds up time by a factor of 8. Compound this with 10 bubbles and you would be travelling insanely fast. WoB is unclear to me, not sure if will double (8x2) or multiply (8x8). We have no information on Cadmiums factor of change, but we can assume that it will be the same as they cancel, and that it'll also compound. Basically, you can use primer cubes each powered by Bendalloy and Cadmium, structured in specific layers. All the Bendalloy bubbles would need to be outside, and you would need about double the amount of Cadmium bubbles to counteract the Bendalloy bubbles and still create their own time-slowing bubbles. What do you guys think? Any other technology which would make FTL travel feasible or easier for Scadrians? (This is my first theory, so there might be gaps in knowledge. Feel free to point them out).