nobody knows but the size of the universe has been found out...
you are most likely aware of what the big bang theory is. it did not create everything in the universe as the way it is today. it actually created the foundation for everythin in the known universe. for example, the grand canyon did not form from the big band theory, it just put the matter in the right place for it to form.
The "big rip" is a possibility that has been discussed, about the future fate of the Universe - not something that has been confirmed.
If you are referring to the Big Bang, I am afraid that there is not really an answer for you. Cosmology (the study of the universe and its origin) is such a recently developed science that there is yet not way to explain why the Big Bang occurred in any terms more than conjecture. It is thought to have been caused either by a collision or rubbing together of other universes, or a presence of enough room in the 'multiverse' for another universe to form. If you really want to pursue an answer to this question, the best answer I can give you is this: become a cosmologist.
The big idea for space and time is that the universe contains matter. Gravity and energy influence the formation of galaxies, and all matter of the universe.
Why our Universe is composed almost entirely of matter, with almost no anti-matter in it.
you are most likely aware of what the big bang theory is. it did not create everything in the universe as the way it is today. it actually created the foundation for everythin in the known universe. for example, the grand canyon did not form from the big band theory, it just put the matter in the right place for it to form.
13 billion years ago because of the Big Bang.
Events in the Universe are often dated from the Big Bang. But the fact is, NOBODY KNOWS what (if anything) happened before the Big Bang. The Big Bang MAY have been the start of time itself; but it is possible that the Universe existed (in some form) forever in the past.
After the big bang when the temperature of the universe cooled down, the gases combined to form matter in the form of planets.
The big bang was the source of the matter in the universe, some of which eventually formed the earth.
The expansion of every part of our Universe was as big as our Universe -- which, if not infinitely large, is pretty big.
The cooling temperatures 360,000 years after the big bang.
The cooling temperatures 360,000 years after the big bang.
Neutrons combined with protons to form the Universe's deuterium and helium nuclei in a process called the Big Bang nucleosynthesis
in the universe
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Infinitely big. Except that, if the universe is closed and curves back on itself, then any "straight" line in it will also follow the curvature of the space-time and so will form a circle whose radius is the same as that of the universe. In either case, seriously BIG.