搜尋結果
2014年4月23日 · In the standard ΛCDM model of the Big Bang, the universe is infinite and has always been such. The Big Bang singularity happened everywhere, in the sense that far back enough in time, the density diverges to infinity at every place. But this is just a particular model--it assumes that the universe if spatially flat and is globally homogeneous ...
2016年11月12日 · The measure in the middle of the image represents 1.5 billion light years. light travels in every direction, and at the time of the big bang, there was no light to travel anywhere, and early in the theory of the big bang, there were no 3D directions that we can conceive, no definition of straightness and edge, no distance in between anything in ...
2016年2月21日 · When was visible light for the first time created? "A few minutes into the expansion, when the temperature was about a billion (one thousand million) kelvin and the density was about that of air, neutrons combined with protons to form the universe's deuterium and helium nuclei in a process called Big Bang nucleosynthesis.
2021年4月14日 · in current models of the Big Bang, what happens to the products of baryon annihilation? In current thinking about the Big Bang, the baryogenesis phase involves CP/CPT symmetry violation. There is an excess (says Wikipedia) of perhaps 1 in $10^{10}$ baryons over antibaryons, the majority ... big-bang-theory.
Following the Big Bang the Universe continues to expand, presumably and roughly equally in all directions. It is understood that the Big Bang occurred 13.798 ± 0.037 billion years ago. Is there any way for us to know how far we are away from the nearest edge of the expansion front of the Big Bang? universe. big-bang-theory.
2016年1月7日 · The Universe is, and has always been, infinite. The Big Bang was just when the Universe's expansion really began — that is, when objects started drifting away from each other. The Universe was still infinite, but there was less space between the matter. This density caused the Universe to get extremely hot and expand.
The Big Bang is when the space of the universe started expanding. Near the formation of a black-hole they tell in this same article that matter and magnetic field play a key role the gamma-ray bursts. True enough. But as far as I know matter and magnetic fields played no role in the Big Bang. I know magnetic fields are induced by charge ...
3. Yes, we do. The exact spot is: All of the universe. In the Big Bang, space-time itself expanded. To say that it took place only at a certain location, you would need something which is external to the entire universe. There is no such thing. Relative to us, we are inside the region that the Big Big started at.
2. The most significant assumption is that very shortly after the Big Bang, the universe expanded very rapidly for a short period of time. Much faster than normal expansion due to Big Bang. It was an exponential expansion and occurred around 10−32 10 − 32 seconds after Big Bang and lasted for tiny fraction of second.
The universe is about 13.8 billion years old. Assume at the big-bang it starts from a small region and the maximum possible speed according Einstein is the speed of light how can the universe got a radius of 46 billion light years? According my understanding it could have a max. radius of 13.8 billion light years only.
