If you draw a triangle on the surface of a balloon, its three angles will add up to more than 180 degrees. Alternatively, if you draw a triangle on a surface that curves outward like a saddle, its angles will add up to less than 180 degrees. Our best theory for describing such large-scale structures is general relativity, Albert Einstein's crowning achievement, which sets out how space, time and gravity work. But it takes a huge amount of energy to make all those stars and planets. But for that we need another trick: cosmic inflation. Or am I just high? Relativity is very different from quantum mechanics, and so far nobody has been able to combine the two seamlessly. First we have to take a look at the realm of quantum mechanics. I believe they are both good questions. People have wrestled with the mystery of why the universe exists for thousands of years. Since the existence of anything requires a cause, this is the proper way to ask the question: Why does anything exist? THERE is plenty to recommend the standard model, our best description of particles and their interactions. If all the galaxies are flying apart, they must once have been close together. Where did the universe get all this energy? Even the most perfect vacuum is actually filled by a roiling cloud of particles and antiparticles, which flare into existence and almost instantaneously fade back into nothingness. Bizarrely, it may not have had to get any. But the physicists argue that it follows naturally from science's two most powerful and successful theories: quantum mechanics and general relativity. Bizarrely, this doesn’t seem to be the case. The immune system: can you improve your immune age? In particular, it neatly explains why the cosmic microwave background, the faint remnant of radiation left over from the Big Bang, is almost perfectly uniform across the sky. (See Four causes) We might want to know how we exist, which can be answered scientifically or with God, I don’t personally worry about that question either. The basic reason that “anything” exists is that shortly after the initial diffusion of the “Big Bang”, the Higgs field allowed the newly-formed subatomic particles to have mass. Anything of any kind, anywhere. Pretty much every ancient culture came up with its own creation story - most of them leaving the matter in the hands of the gods - and philosophers have written reams on the subject. In the case of the universe, the matter goes on one side of the scale, and has to be balanced by gravity. Alternatively, space-time could curve outward like a saddle. Intuitively, there shouldn’t be anything to explain. As Krauss puts it, "The laws of physics as we understand them make it eminently plausible that our universe arose from nothing - no space, no time, no particles, nothing that we now know of.". It could be as flat as a table top. One thing they have found is that, when quantum theory is applied to space at the smallest possible scale, space itself becomes unstable. "In quantum physics, if something is not forbidden, it necessarily happens with some non-zero probability," says Alexander Vilenkin of Tufts University in Boston, Massachusetts. In that case, there should be …. And yet here we are. Nothing and something are opposing ends of the same coin toss. It’s just a big infinite … In quantum physics, if something is not forbidden, it necessarily happens. This is the branch of physics that deals with very small things: atoms and even tinier particles. Many would agree that things that exist must have an explanation; a reason why they are. These so-called virtual particles don't last long enough to be observed directly, but we know they exist by their effects. It could curve back on itself like the surface of a sphere, in which case if you travel far enough in the same direction you would end up back where you started. Why Does the World Exist? You might remember from maths class that the three angles of a triangle add up to exactly 180 degrees. ", or, "Why is there something rather than nothing?" I know how much he stated about reasons why we should not exist such as Nirvana being the highest goal to escape from the karma bond!! What links post-Everett QM; the cancellation of the Universe's conserved constants to zero; black holes; and zero construed as a number in mathematics? It uses sensible words and grammar and has the form of a question and so on. That's because only a flat universe is likely to have come from nothing. 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