Which universe do we live in

Sometimes, they might slam into each other, causing repeated Big Bangs that reset the universes over and over again. The theory of quantum mechanics, which reigns over the tiny world of subatomic particles, suggests another way multiple universes might arise.

Quantum mechanics describes the world in terms of probabilities, rather than definite outcomes. And the mathematics of this theory might suggest that all possible outcomes of a situation do occur — in their own separate universes.

For example, if you reach a crossroads where you can go right or left, the present universe gives rise to two daughter universes: one in which you go right, and one in which you go left. Scientists have debated whether mathematics is simply a useful tool for describing the universe, or whether math itself is the fundamental reality, and our observations of the universe are just imperfect perceptions of its true mathematical nature.

If the latter is the case, then perhaps the particular mathematical structure that makes up our universe isn't the only option, and in fact all possible mathematical structures exist as their own separate universes.

It is believed that the Milky Way is larger than first estimated. There is also suspicion that our galaxy is in the process of absorbing other smaller galaxies. However, there is not enough empirical evidence available to support the claim. So what would be so important about knowing what part of the galaxy we live in?

One reason is space exploration. Some time in the future mankind may find a way to achieve faster than light space travel. This can provide a new set of challenges for engineers and astronomers to tackle. One possibility is that there is some strange, invisible force that causes this pencil to stand on its point.

Gravity aside, physicists are averse to postulating strange, invisible forces, so perhaps this strange pencil is just a weird fluky event, however improbable. Such is the case in contemporary cosmology in what is referred to as the fine-tuning problem.

There are a dozen such fine-tuning issues that confound cosmologists. The expansion rate of the universe, the ratio of matter to antimatter, the specific values of the weak and strong nuclear forces, the mass ratios between electrons, protons, and neutrons, the list goes on.

If any of these variables were ever so slightly different, then none of the complexity we see around or inside us would be possible. In other words, life and consciousness could not have evolved. Where biologists see random drift and natural selection in the messy story of life, physicists see elegant improbabilities in the ordered and intelligible nature of the cosmos.

Some extend the weird role of the observer in fixing the uncertainty in quantum events to apply to the universe as a whole. Which planet is called God of War?

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