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Physics
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According to early versions of the Big Bang theory, the universe has been expanding ever since with gravity gradually putting the brakes on that expansion.
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We don't know what dark energy is, but the best idea is that it's the energy of empty space itself, the energy of the vacuum.
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Einstein himself spent most of his later years on a futile search for a unified theory of physics, and physicists have kept at it ever since.
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It's been estimated, in fact, that there are ten to the five hundred different versions of string theory. Each one would describe a different universe with different laws of physics.
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In most of the multiverse, dark energy is so strong that the universe gets torn apart, or the Higgs field is so weak that no atoms can form.
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