If you look at our solar system and our galaxy, the stars and planets are generally all in one plane. So, are all galaxies in one plane? And why are they in one plane?
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duplicates list edited from Why do all the planets of the solar system orbit in roughly the same 2D plane?, Why are our planets in the solar system all on the same disc/plane/layer? [duplicate] to Why do all the planets of the solar system orbit in roughly the same 2D plane?, Why are our planets in the solar system all on the same disc/plane/layer? [duplicate], Why the galaxies form 2D planes (or spiral-like) instead of 3D balls (or spherical-like)?
Qmechanic ♦
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