At the centre of the controversy is a popular theory that our universe inflated like a balloon right after the Big Bang. One group of scientists essentially said this theory wasn't science — which is like calling artist's work "not art", or a chef's "not food".
Except that Science is not like Art or Food. The definition(s) of art change over time, and what might be food to some might not be to others (says someone who's lactose intolerant). Rather, if it's science it can be tested.
If it's science (see http://undsci.berkeley.edu/article/whatisscience_05) you can devise a test in which, if the theory is correct, you can make predictions by using that theory which will either be confirmed or proven incorrect. If you can't do that, it's belief, not science.
https://www.gizmodo.com.au/2017/05/thirty-three-famous-physicists-sign-angry-letter-about-the-origin-of-the-universe/
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