Mike
If the world is so large.... does gravity not work the same way in this universe?
Will Wight
Part of the answer is "magic," and part of it is how this world developed differently because of magic.I made Cradle very big. Why? A few reasons.First, a lot of wuxia and xianxia stories do it so they can scale up to ridiculous numbers. Where first the character thinks a huge city has ten thousand people, later a huge city has ten BILLION people.Also, they're so special they're not just one in a million, they're one in a TRILLION! And they go from crossing a thousand miles in a single step to a hundred thousand miles!
So in part, it's an homage to the genre.In part, it's so that I can set other stories in the same world and they've never even heard of the people, places, or events in Lindon's story.And in part it's to illustrate that this isn't Earth. The Iterations are Narnia-style "worlds," not different planets, but since it's a whole new universe each time, they are ALSO different planets. I wanted a way to show that without putting a second moon in the sky, so "greater surface area and population" it is.
***As for the mechanics of it: I said "Magic" earlier, but that basically boils down to "This is how vital aura works."Vital aura is the power of the world that sacred artists harvest and use to strengthen their madra. It's the spirit of the world, basically. It makes what would otherwise be an uninhabitable planet, habitable.The planet IS less dense than earth, but because of its huge volume, it's more massive. Gravity is much greater. Humans are supported by madra from birth in part because otherwise they wouldn't be able to adapt to the gravity.You have other problems too: does this less-dense core spin fast enough to create a magnetosphere? Wouldn't continents bigger than Earth's just be massive deserts everywhere except immediately along the coast? Wouldn't the surface of such a planet be wracked by storms? Vital aura!
I'll get into it later in the books, but for me building this world, aura served a couple of functions. First, it allows people to adapt to what would otherwise be very harsh natural conditions (Sacred Valley and the immediate surrounding areas have, so far, been very mild. Conditions will accelerate as we get deeper into Cradle). Second, vital aura is generated by natural forces AND it changes natural forces.
I'll continue showing how it works in future books, but the bottom line is that aura allows me to have thriving ecosystems where everything is fire-aspect: trees with burning fruit pollinated by insects with wings of flame, and so on and so forth. Same in the depths of the ocean and on the tops of clouds.
It's magic. But it DOES work consistently according to a set of rules, and it DOES interact with physics.However, I'm not as attached to real-world physics as Brandon Sanderson is. He enjoys figuring out the physical implications of every nuance in his magic systems. I do not enjoy that, so I will not be doing it.If there's a gap between real physics and magic, I'll be filling in that gap with magic. Not physics. Just a personal preference.
Will Wight
It has many times more surface area than Earth.Also, as B pointed out, we haven't seen any REALLY civilized places yet. We'll see a city in Blackflame, but even that will be a relatively small, isolated city.Thanks to vital aura and the power of madra, there are lots of inhabited places in Cradle that would be uninhabitable on Earth. For instance, there are cities on the bottom of the ocean. And on the surface of the ocean. And on the clouds.
