So, I was thinking how the third trilogy was mentioned as being in the future (as opposed to the second trilogy being contemporary to our time), and I wondered if the people from Scadrial would be able to visit the other shardworlds without using Shadesmar - and, if so, how would they do it?
The simplest (and most boring, and not germane to the topic) method would be FTL travel.
But then I got to thinking about Pulsers and Sliders.
My first thought was, "Hey, what if a bunch of Pulsers - or some Pulser-inspired technology - could put a bubble around the crew quarters of a starship? That would allow the crew to travel from one system to another within their own lifetimes." Just put the ship on autopilot, power up the Pulser Engine, and go have a sandwich.
Then I tried to figure out if something similar might work for Sliders, but the first bump I hit was that bendalloy bubbles - and cadmium bubbles - were stationary. Which, in turn, would probably rule out the Pulser starship.
But then I thought some more. These books take place in a universe which is, astronomically, pretty much like our own. It follows the same rules of physics. Which means that Scadrial is rotating on its axis, while it revolves around its star, while that star moves within its galaxy, and that galaxy moves within its universe.
Which means, technically, bendalloy and cadmium bubbles aren't stationary. They're stationary relative to one object - Scadrial - but they're perfectly mobile when one looks at the bigger picture.
This makes me think that a Pulser starship might be possible, provided the Pulsing can be anchored to the ship rather than Scadrial.
It also makes me wonder why the default anchor is the planet and why nobody has figured out how to anchor it elsewhere. Is it simply a mental block that could be overcome? Is a person too small to be used as an anchor (even though the bubbles pop up with the person at the center)? Can a bubble's size be altered, dependent upon the size of its anchor? (That is, could a small bubble be made around, say, a person's heart if the whole person were the anchor?)
I still dig the idea of Allomancers Iiiin Spaaaaace!, though I'm not entirely sure how it would work.
[Links out to WoBs about Metallic Arts FTL being a thing]
So FTL is confirmed
There's an issue with conservation of momentum with speed bubbles.