What is the true meaning of the Big Bang?

  • Context: High School 
  • Thread starter Thread starter Pyrus
  • Start date Start date
  • Tags Tags
    Space
Click For Summary

Discussion Overview

The discussion revolves around the interpretation of the Big Bang theory, specifically addressing the nature of the universe's expansion and the implications of infinity in this context. Participants explore theoretical aspects, misconceptions, and the conceptual framework surrounding the Big Bang, with a focus on clarifying misunderstandings and debating the nature of space and expansion.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants question what the universe is expanding into, suggesting that if the universe is infinite, it was infinite at the time of the Big Bang as well.
  • Others argue that the universe does not expand into anything; rather, distances within the universe increase.
  • There is a critique of the use of infinity in explanations, with some participants expressing that it is an inadequate concept for understanding certain phenomena.
  • A participant references an article that addresses common misconceptions about the Big Bang, suggesting it provides clarity on the topic.
  • Some participants acknowledge corrections to earlier misunderstandings regarding the nature of the Big Bang and its implications.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the universe's expansion and the concept of infinity, indicating that multiple competing interpretations remain unresolved.

Contextual Notes

Some statements reflect assumptions about the nature of the universe and the Big Bang theory that may not be universally accepted, highlighting the complexity and nuance of the topic.

Pyrus
Messages
20
Reaction score
4
We say that in big bang, a highly dense point like structure exploded and expanded.
In what did it expand?
If so, universe and space would be different entities.
Please elaborate.
 
  • Like
Likes   Reactions: Jason R Carrico
Astronomy news on Phys.org
Pyrus said:
We say that in big bang, a highly dense point like structure exploded and expanded.

No, it's not what BB theory says. It says that Universe was in a hot dense state, but if it is infinite it was infinite back then. That being said, your question is based on a wrong assumption, so it does not make sene.
 
weirdoguy said:
No, it's not what BB theory says. It says that Universe was in a hot dense state, but if it is infinite it was infinite back then. That being said, your question is based on a wrong assumption, so it does not make sene.
Thanks for replying and rectifying my mistake.
But then also, universe was hot dense and then it expanded.
I think the concept of putting infinity wherever we cannot explain things is wrong.
We say visible universe is expanding but then, in what is it expanding.
 
Then God said, "Let there be light"; and there was light.

Later

astronomers measured the light and found that it was red-shifted.

Sometimes people speak in circles about this sort of thing. For example, the light measured in a telescope on Earth is measured on earth. Where was the photon? It was in the lens and then in the detector.

Compare "expansion of the universe" with "the energy decay rate of a photon in a vacuum". It is not the same thing but is similar.
 
Pyrus said:
We say visible universe is expanding but then, in what is it expanding.

It doesn't expand in or into something. The distances within the universe increase.
 
Pyrus said:
I think the concept of putting infinity wherever we cannot explain things is wrong.

Is anyone doing that? I don't recall.

Pyrus said:
We say visible universe is expanding but then, in what is it expanding.

It does not have to expand into anything. Distances between galaxy clusters increase, that's all.
 
  • Like
Likes   Reactions: Pyrus and PeroK
I think that the following linked article will be highly illuminating:

http://www.mso.anu.edu.au/~charley/papers/LineweaverDavisSciAm.pdf

This is an article published in Scientific American by Charles Lineweaver and Tamara Davis entitled _Misconceptions about the Big Bang_

It addresses Pyrus' questions and quite a few others in a fairly comprehensible and accurate exposition on what is (perhaps unfortunately) referred to as the Big Bang Theory. It goes a long way to straighten out some of the seeming 'talking in circles'.

Highly recommended.

diogenesNY

P.S. Just for fun, search out the origin of the term Big Bang :)
 

Similar threads

  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 49 ·
2
Replies
49
Views
8K
  • · Replies 17 ·
Replies
17
Views
3K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 24 ·
Replies
24
Views
4K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 2 ·
Replies
2
Views
953
  • · Replies 20 ·
Replies
20
Views
4K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 28 ·
Replies
28
Views
7K