What If the Big Bang Was Caused by Another Universe?

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Discussion Overview

The discussion revolves around speculative ideas regarding the origins of the Big Bang, including potential causes and pre-Big Bang scenarios. Participants explore various theories, including oscillating universes, infinite universes with multiple Big Bangs, and the role of supernovae, while addressing the limitations of current understanding in cosmology.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant suggests that the Big Bang could have been caused by a previous universe collapsing and then expanding, although this model is considered less likely due to current observations of rapid expansion.
  • Another participant proposes a theory of an infinite universe with multiple Big Bangs occurring at different points, allowing for a cycle of expansion and potential future collisions.
  • A different viewpoint questions whether a supernova could have caused the Big Bang, but this idea is met with skepticism regarding its alignment with current cosmological models.
  • Some participants emphasize the speculative nature of these ideas, noting that they lack predictive power and should not be mistaken for established theories.
  • There are calls for more engagement with actual cosmological literature to better understand the current scientific consensus and observations related to the Big Bang.

Areas of Agreement / Disagreement

Participants express a range of speculative ideas about the origins of the Big Bang, but there is no consensus on any particular theory. Some ideas are challenged based on their compatibility with current observations, indicating ongoing debate and uncertainty.

Contextual Notes

Participants acknowledge the limitations of their speculations, particularly in relation to the lack of predictive power and the need for advanced physics to substantiate claims about pre-Big Bang scenarios.

KevinT
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In school we are talking about the big bang, and it made me think. What if the cause of the bang was from a group of galaxies before us, very similar to us, and it was expanding just like our, but then we hit a "border", which caused a reverse action. Making that universe compact together and get so tight that it created a very large expansion, which we call the big bang theory.
 
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Welcome to PF!

No one really knows why the Big Bang happened or if there was a "before", but one possibility is that the universe oscillates between expansion and contraction and "before" its current incarnation was another universe that collapsedin on itself, starting the cycle again.

However, at the moment it is believed that the universe is expanding too fast for that to be a likely model.
 
My personal favorite theory on what happened before the big bang involves a truly infinite universe in which there are infinite big bangs that explode a certain points, and expand outward to eventually crash into each other. This allows for each big bang to accelerate as quickly as ours is right now, but also allows for a re-coallescense of matter at a certain point in the future to generate more big bangs.

Just a fun thought.
 
playludesc said:
My personal favorite theory on what happened before the big bang involves a truly infinite universe in which there are infinite big bangs that explode a certain points, and expand outward to eventually crash into each other. This allows for each big bang to accelerate as quickly as ours is right now, but also allows for a re-coallescense of matter at a certain point in the future to generate more big bangs.

Just a fun thought.

Just a note, it's fine to hold your own opinions and beliefs about topics science hasn't (or cannot) shed light on, but don't delude yourself into thinking they have any predictive power. In the absence of very advanced and speculative physics and mathematics, it's just as justifiable to say that when two of these 'regions' collide they generate pink unicorns.
 
I'm well aware :) Any speculation as to what happened before our big bang is only that. I apologize for my loose usage of the term "theory".
 
is it possible that the big bang was caused from the first supernova which formed with every gas cloud there was creating an unimaginably large star
 
blanksbyj01 said:
is it possible that the big bang was caused from the first supernova which formed with every gas cloud there was creating an unimaginably large star

In short, no. Nothing about this agrees with our observations and models of the universe.
 
Why doesn't it agree with the current observations, what are they?
 
Last edited:
blanksbyj01 said:
Why doesn't it agree with the current observations, what are they?

Where to begin ...

You really should read some actual cosmology. You might find it interesting.
 
  • #10
blanksbyj01 said:
Why doesn't it agree with the current observations, what are they?

Read the following threads: https://www.physicsforums.com/forumdisplay.php?f=206
 
Last edited by a moderator:
  • #11
Usually, scientists assume the most simple explanation, until some evidence comes along that disproves it. At the moment, the most simple explanation (that is yet to be disproved) is the big bang theory. Which is why it is generally accepted.
 

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