13

It depends on the size of the planet. A key concern is whether the body is in hydrostatic equilibrium. An object in hydrostatic equilibrium is approximately spherical, although it may become oblate due to rapid rotation. The question, then, is whether the division of the planet places it below the critical size required for hydrostatic equilibrium. It turns ...


6

If I understand thing correctly, if a righty person carries a box of righty food around the world and back to the same place in a certain way, he will end up a lefty person with a box of lefty food - without the feeling of having changed himself, so the other righties around him will look like lefties to him. I'm not fully with you on the math, so I hope ...


4

This would be very hard to do, but you could make it work, maybe ... if you're not too strict. Problems: Based on the IAU definition of a planet, your hemispherical planet no longer meets the classification of a planet due to its shape not being consistent with Hydrostatic equilibrium. Most planets are subject to the tendency toward hydrostatic equilibrium ...


4

An infinite flat surface would not work from a gravitational perspective as the surface would disintegrate under gravity into lots of small planets or if there was no rotational movement a single ever expanding black hole. So best to use a planet or Dyson ring. The habitability of the tunnels would depend on a lot of factors: the depth of the ocean, the ...


3

Air Pressure Follows the Same Rules there as on Earth Atmospheric pressure is largely the effect of the amount and composition of gasses, and the effect of gravity on the gasses. Due to how fluid pressure works, the use of tunnels is largely irrelevant and can be safely ignored. Assuming your world is not infinite horizontally, but is rather arbitrarily ...


2

Blocking sunlight does not cause scattering or change the observed colors in the way that a sunset does; it only makes the sky darker or lighter, depending on how much sunlight was blocked. With all of the sunlight blocked (the umbra), we have night or near-night. With none of the sunlight blocked (the antumbra), we have sky blue (not including sunsets). And ...


2

There is a horizon on an infinite flat plane I'm really surprised that no-one understands perspective and in particular the mathematical concept of a limit. Here's a non-mathematical explanation. Imagine an infinite flat earth with perfect visibility. Above it is an infinite flat sky that is parallel to the earth. The land won't go up forever and the sky ...


1

Planets are such because they are in hydrostatic equilibrium. This means that if you would cut it in half, it would crumble under gravity to a spherical shape again. The orientation of the rotational axis has little to do with this.


Only top voted, non community-wiki answers of a minimum length are eligible