What Is the Shape and Expansion of the Universe?

LSulayman
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Hello,
I'm working on an assignment where I explain some things about the universe.
This is what I'm writing about and also in the order in which I'm writing about it:

Part I The Shape of the Universe

Matter
The static model of the universe
A universe which is not static but:
closed universe
flat universe
open universe

Part II Evidence for the expanding universe

Measuring the age of the universe
Other evidence
What role does dark matter have in an expanding universe?

Now my teacher told me that the order in which I'm telling these things isn't right, somethings not ok with the structure...

Since I'm not an expert on the expanding universe (I'm not a physicist or an astronomer) It's really frustrating to understand what the right order is, when to write about what.
Also Part I and Part II have to have a connection. But how to explain?

Can someone help me out?
 
Space news on Phys.org


The purpose of your paper is unclear. Start with an abstract summarizing the question or questions you intend to address and evidence relevant to that effort. You should then formulate a title that condenses your abstract to a simple idea like 'Is the Universe Expanding?'. You may then introduce the various facts and factors you deem relevant and how you believe they lead to your conclusions.
 

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
View full post »

Thread 'Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".'

The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New Brunswick campus. Here is an excerpt: Computer modeling of the gravitational lens by Keeton and Eid showed that the four visible foreground galaxies causing the gravitational bending couldn’t explain the details of the five-image pattern. Only with the addition of a large, invisible mass, in this case, a dark matter halo, could the model match the observations...
View full post »

Thread 'Big Bang and Infinite Universe'

Hi, I’m pretty new to cosmology and I’m trying to get my head around the Big Bang and the potential infinite extent of the universe as a whole. There’s lots of misleading info out there but this forum and a few others have helped me and I just wanted to check I have the right idea. The Big Bang was the creation of space and time. At this instant t=0 space was infinite in size but the scale factor was zero. I’m picturing it (hopefully correctly) like an excel spreadsheet with infinite...
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