Minggu, 02 Oktober 2011

How Many Universes Are Out There?



Soon dozens of alternate-universe Supermans existed, ranging from the medieval British Superman "Kal" to the Soviet Superman featured in "Red Son." Although certainly a cool way to handle multiple takes on the same character, the multiverse approach has its roots in the world of theoretical physics. Hugh Everett III's 1950s Many-Worlds theory argued that the universe we know is but one of infinite parallel universes, each different from the last.

In some of these universes, the difference would be slight -- such as a parallel universe where everything is the same except you had a bagel instead of cereal for breakfast this morning. Other universes would differ in ways that alter reality on a grand scale.

For instance, imagine a parallel universe with no gravity (although some would argue that gravity is the very thing responsible for the universe's existence.)

But let's get back to the science behind the theory. Everett's work changed comics forever, but he actually set out to explain why quantum matter behaves erratically. At the minuscule, subatomic level of quantum physics, many physics laws, those defined by Einstein's general theory of relativity, break down.

Here, tiny particles of light called photons appear to change form at random. Physicist Werner Heisenberg even theorized that they change due to simple observation. Danish physicist Niels Bohr's Copenhagen interpretation takes this one step further, proposing that a quantum particle exists in all states simultaneously. Physicists call this state superposition.

So do other universes like ours exist? Some scientists indeed believe that they do. For now, however, that belief can't be proven, and our universe remains the sum of known existence.

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