Linked Questions
23 questions linked to/from Why the galaxies form 2D planes (or spiral-like) instead of 3D balls (or spherical-like)?
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Why is the Milky Way flat? [duplicate]
I read recently that the galactic "flatness" of the Milky Way is due to the rotation of the galaxy combined with a vast stretch of time.
Yet, I also read where 1) the Milky Way rotates once every 225 ...
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why galaxies look like discs rather than spheres? [duplicate]
Black holes have much gravitation to hold all stars and nebulas
but why they are aligned in disc type shapes rather than spheres
because gravitation is everywhere around black holes. Even on upper ...
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Why does most galaxies resemble a 2 dimensional plane? [duplicate]
Older galaxies mostly tend the revolve forming a disk. Why are the stars not revolving around the center of the galaxy like a sphere instead similar to electron in an atom?
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Shape of galaxies [duplicate]
i want to know why galaxies are spiral in nature..
let us say there is some sort of intense mass (black hole?) at the centre of our milky way galaxy. the intense gravitaional pull is keeping evey ...
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Why are galalxies spiral? [duplicate]
In every picture we see that galaxies are spiral, why so? are there any other shapes possible?
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Why aren't there spherical galaxies?
According to the Wikipedia page on Galaxy Types, there are four main kinds of galaxies:
Spirals - as the name implies, these look like huge spinning spirals with curved "arms" branching out
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Why does everything spin?
The origin of spin is some what a puzzle to me, everything spin from galaxies to planets to weather to electrons.
Where has all the angular momentum come from? Why is it so natural?
I was also ...
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Why are there so many objects perfectly orbiting each other? Isn't it infinitely more likely that two random objects crash/fly apart?
If, in free space, I throw two objects towards each other, they can either miss each other and fly apart (if the velocity is enough and there's not enough gravitational attraction between them), or ...
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Why do all the planets of the solar system orbit in roughly the same 2D plane?
Most images you see of the solar system are 2D and all planets orbit in the same plane. In a 3D view, are really all planets orbiting in similar planes? Is there a reason for this? I'd expect that the ...
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Why are our planets in the solar system all on the same disc/plane/layer? [duplicate]
I always see pictures of the solar system where our sun is in the middle and the planets surround the sun. All these planets move on orbits on the same layer. Why?
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How do the Planets and Sun get their initial spin?
How do the Planets and Sun get their initial rotation?
Why do Venus and Mercury rotate so slowly compared to other planets?
Why does Venus rotate in a different direction to Mercury, Earth and Mars?
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Shapes of galaxies
I've heard most of galaxies are spiral or ellipsoid shaped. Is it true?
If true, then why they form in such shapes?
How did arms of the spiral galaxies form?
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Why don't stars in globular clusters all orbit in the same plane?
Globular clusters like Omega Centauri certainly don't seem to be very coplanar at all.
In other words, why doesn't the explanation at Why are our planets in the solar system all on the same disc/...
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Accretion disk physics - Stellar formation
I was going through the Wikipedia page for Accretion disks, and I couldn't comprehend what the meaning of this is:
"If matter is to fall inwards it must lose not only gravitational energy but also ...
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Too big to revolve like an atom? [closed]
At what point do objects naturally start revolving as a disk?
From an atom, with which the electron revolves as a sphere, to a galaxy, that revolves in the same direction?
I herd about rigid ...
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