• Brainly User
NO ONE could answer that.... Even Scientists are searching for that from a long time.. There are certain thing that cannot be explained..  :)

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There are two theories which say about universe they are big bang theory and steady state theory big bang states that universe was a hot ball when it overheated and blasted all parts of it moved away after they started moving they cooled down and became planets steady state theory say universe existed it is exstiting  and it will exist and about your thought is good one according to my view humans did not know about the space because it is always mystery to us so no one knows about the expanding of universe