Why does most galaxies resemble a 2 dimensional plane?
84229
Why the galaxies form 2D planes (or spiral-like) instead of 3D balls (or spherical-like)?
96397
Optical explanation of images of stars?
100799
How distorted does the Andromeda Galaxy appear to us due to the speed of light?
71711
Why a tesselation of the plane by a convex polygon of 7 or more sides is not possible?
107818
What is the shape of the focal plane?
99829
If a plane is divided by $n$ lines, then it is possible to color the regions formed with only two colors.
44124
Why is a Hyperplane called a "Hyper"plane?
6323
existence of complex structure in dimension 2
64734
Distribution of Dark Matter around galaxies
120404
Showing that the geodesics in hyperbolic upper half-plane model are half circles
52316
Geodesics and Curves on a Plane
15799
Experimental evidence of a fourth spatial dimension?
62413
Reflection across the plane
19497
Analogue of spherical coordinates in $n$-dimensions
22959
Does every even-dimensional sphere admit an almost complex structure?
2305
Why are orbits elliptical?
94233
Why are images formed?