Science consists in the search for explanations of puzzling facts, and theory is the final step on a mountain ascent.
Start with an educated guess, or conjecture. This is a statement of “likely” behavior of some part or element of the universe. This is where the scientist has imagined a new explanation for some phenomenon that has not good explanation at present, or has a differing conjectured explanation. A researcher finds funding to conduct experiments, adjusts the wording or whole structure of the conjecture.
Next is the hypothesis. The researcher has managed to shape the explanation into something that can be tested. Other researchers run experiments of their own to “test the envelope” or locate odd cases where the hypothesis does, or does not, work perfectly.
The pinnacle is an explanation that meets all tests science can perform, and every test result reinforces that explanation.
NOTE: theory isn’t proven; it has survived all attempts to disprove it. A next set of researchers may spot a hidden flaw, thus disprove the theory.
But at all times scientists, instead of “thinking up” some hairy new theory or natural law, confine themselves to the ones on hand.
Nothing can ever explain why something came from nothing for the simple reason that science confines itself to the universe as it exists. In this universe there is no “uncaused cause.” Conjectures abound regarding the origin of the universe, but none of them can be tested.
Genesis 1:1,3 state that G*D instantiated time, space, matter, and light. Verse 2 is a pat on grandfather’s head; it grandfathers in a prior foundational conjecture because Genesis, aside from those two verses, is theology. It concerns the Creator, rather than creation itself. It does so in a page of imagery; to bring it up to fact you would need to include a long shelf of PhD theses (etc.)