June 7th, 2018, 03:23 AM  #11  
Senior Member Joined: Apr 2014 From: Glasgow Posts: 2,139 Thanks: 721 Math Focus: Physics, mathematical modelling, numerical and computational solutions  Is it? There's no evidence to differentiate yay or nay. Everyone can agree that if you take an expanding universe and extrapolate backwards in time, you get a smaller and smaller volume of space, but was cosmogenesis the beginning of "everything"? Some cosmologists hypothesise that there are many crunch/big bang cycles, in which case the big bang we observe is just one of many that have happened. Furthermore, some hypothesise that the observable Universe may just be part of a bigger Universe with many big bangs in it, in which case the "start" is just the moment in time which corresponds to the big bang that we observe with the rest being beyond the observable universe. Again, there's no evidence to differentiate any of this stuff, but it provides context and reveals just how little we know about our own observable Universe at the largest scales. Quote:
Quote:
Cosmology is a nascent field and is developing all of the time, but it is easy to ask difficult questions and very difficult to find answers.  
June 7th, 2018, 10:01 AM  #12 
Senior Member Joined: Sep 2015 From: USA Posts: 2,320 Thanks: 1232 
Given the horizon caused by the expansion of spacetime I think there are going to be questions we simply will never have the data to answer.


Tags 
bang, big, quasars, similarities, supernovae 
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