@AC
The fact that the universe is expanding is the proof that in the past it was more "compressed", just replay the movie in reverse. The expansion is done with conservation of energy but dilution, therefore with reduction of energy density, hence the hypothesis of "thermodynamic death" of the universe in billions of years.
I don't pretend to be a physicist but I have spent a lot of time trying to understand (incompletely of course) the validity of the great theories, notably electromagnetism, relativity, QM. I urge you to do the same. These theories are only common sense pushed to the extreme from observable facts. They have drastically reduced the unknown since 2 centuries. To contest them with arguments as light, incomplete, inconsistent, always against, as yours, imagined from the popularization of science which is far, very far from bringing a degree of knowledge of the academic science sufficient to dispute it, and without logical or even mathematical formalism, is vain, even harmful because it is a form of anti-science obscurantism.
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"Open your mind, but not like a trash bin"
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