Question about relation between galaxies

In summary, the placement of galaxies in our observable universe as spirals of solar systems with empty space between them is due to the process of gravitational collapse. This process was set in motion by the Big Bang, which created the universe from a point of singularity. However, the formation of galaxies and other celestial bodies did not occur until well after the Big Bang. The distribution of matter in the universe is described by the power spectrum, which is a result of the combination of initial randomness and the effects of gravitational collapse. Each galaxy is its own entity and was not necessarily created in relation to other galaxies.
  • #1
jon_pan
6
0
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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  • #2
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.
 
  • #3
You have a naive concept of the universe, jon pan. ST took you through the basics.
 
  • #4
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
 

1. What is the relationship between galaxies?

The relationship between galaxies is one of mutual gravitational attraction. Galaxies are constantly moving and interacting with each other due to their gravitational fields. This can sometimes result in mergers or collisions between galaxies.

2. How do galaxies influence each other?

Galaxies can influence each other through their gravitational forces, which can affect the shape and movement of the galaxies. They can also exchange gas and dust, which can impact the formation of new stars within the galaxies.

3. Can galaxies merge?

Yes, galaxies can merge with each other. This can occur when two galaxies come close enough together that their gravitational forces cause them to combine into one larger galaxy. This process can take millions of years to complete.

4. What happens when galaxies collide?

When galaxies collide, the gravitational forces between them cause them to interact and merge. This can result in the formation of new stars, as well as distortions and changes in the shapes of the galaxies involved.

5. How do scientists study the relationships between galaxies?

Scientists study the relationships between galaxies through various methods, such as observing their movements and interactions using telescopes, studying the distribution of gas and dust within galaxies, and analyzing the light emitted from different types of stars in different galaxies. They also use computer simulations to model and understand the dynamics of galaxy interactions.

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