Question about relation between galaxies

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Galaxies are positioned in the observable universe due to the gravitational collapse of overdensities in a nearly uniform hydrogen gas following the Big Bang. Initially, the universe was not completely uniform, leading to areas of varying density that eventually formed stars, galaxies, and clusters over time. The distribution of galaxies is described by the power spectrum, which illustrates how these overdensities evolved. Rather than being created independently, galaxies formed in relation to one another through gravitational interactions. This understanding clarifies the structured appearance of galaxies amidst vast empty spaces in the universe.
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why is it that galaxies are placed the way they are in our observable universe? as spirals of solar systems with empty space between them?

isn't it a concept of the big bang theory that, the universe was created from a point of singularity? And at an instant, all matter was ejected from that point? if so, then why does our universe appear the way it does? Should it not look more like scattered planets and stars exploding from a single point? which then eventually collapse back to that point?

to me it seams more reasonable that each galaxy is it's own, and not created relative to other galaxies. something like a big bang to create each galaxy.
 

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I'm not sure I understand your question, but remember that stars, planet, galaxies, etc. were not formed during the Big Bang, but well after. The basic picture is that you start with a universe that's nearly, but not completely uniform (mostly hydrogen gas). As time goes on, those parts of the universe that are slightly more dense than the others (overdensities) will start to collapse. In the current cosmological model, the first things to collapse will be tiny galaxies and star clusters. As time goes on, bigger and bigger objects collapse to form larger galaxies (like the spiral in your picture) and, eventually, galaxy clusters.

The relationship between the positions of galaxies is roughly described by the power spectrum. Think of the distribution of matter in the universe like a foam, with overdensities appearing randomly in space and the distribution of overdensities given by the power spectrum. Today, this distribution is a combination of the initial randomness in the nearly uniform hydrogen gas and the effects of gravitational collapse that occurred afterwards.
 
You have a naive concept of the universe, jon pan. ST took you through the basics.
 
Chronos said:
You have a naive concept of the universe, jon pan. ST took you through the basics.


i know, that's why I'm here asking question. thankx for the input
 

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