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Is Big Bang as an explosion from singularity still a thing as a theory? Brian Cox said in an interview that what we really know is that 13 bilions years ago the universe was very hot and very dense and that's pretty much it

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Is Big Bang as an explosion from singularity still a thing as a theory? Brian Cox said in an interview that what we really know is that 13 bilions years ago the universe was very hot and very dense and that's pretty much it	72
Why do they say gravity is expressed as waves? Isn't it more like constant effect on matter and space?	16