Why are galaxies flat since it's an unstable configuration in 3d?
29994
Why are some galaxies flat?
95221
Is the cuspidal cubic $\{y^2 = x^3\} \subset \Bbb R^2$ not smooth?
114501
Is Dyson Sphere a stable construction?
58800
Why is 3D stress tensor acting only on three surfaces?
6486
Why isn't dark matter just ordinary matter?
63896
Why is the (non-relativistic) stress tensor linear and symmetric?
15338
Why is the centre of mass displaced even when external force is 0?
75058
Why isn't an infinite, flat, nonexpanding universe filled with a uniform matter distribution a solution to Einstein's equation?
78910
What causes matter to initially rotate/spin/orbit?
123846
How Does Hubble's Expansion Affect Two Rope-Tied Galaxies?
64734
Distribution of Dark Matter around galaxies
6458
Structure formation: Galaxies as different entities and stars as groups
94731
Flat surface not being shaded consistently across quads
155392
When deriving $d\sin\theta=n\lambda$ are the light rays approximately parallel or actually parallel?
105211
What is an intuitive way of understanding Ostrogradsky instability?
3108
Why does space expansion not expand matter?
58224
BH singularity? Infinite density