Big Bang

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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.
 

russ_watters

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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.
 

Nabeshin

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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
 

Drakkith

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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?
 
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phinds

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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.
 

Drakkith

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Why doesn't it agree with the current observations, what are they?
Read the following threads: https://www.physicsforums.com/forumdisplay.php?f=206 [Broken]
 
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BruceW

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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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