How The Life Begin

Planck epoch Times shorter than 10 −43  seconds ( Planck time ) Main article:  Planck epoch The  Planck epoch  is an era in traditional (non-inflationary)  Big Bang cosmology immediately after the event which began our known universe. During this epoch, the temperature and average energies within the universe were so high that everyday subatomic particles could not form, and even the four fundamental forces that shape our universe— electromagnetism ,  gravitation ,  weak nuclear interaction , and  strong nuclear interaction —were combined and formed one fundamental force. Little is understood about physics at this temperature; different hypotheses propose different scenarios. Traditional big bang cosmology predicts a  gravitational singularity  before this time, but this theory relies on the theory of  general relativity , which is thought to break down for this epoch due to  quantum effects . In inflatio...

Outline For the purposes of this summary, it is convenient to divide the chronology of the universe since it  originated , into five parts. It is generally considered meaningless or unclear whether  time existed before this chronology: The  very early universe  – the first  picosecond  (10 −12 ) of cosmic time. It includes the  Planck epoch , during which currently understood  laws of physics may not apply; the emergence in stages of the four known  fundamental interactions  or  forces  – first  gravity , and later the  strong ,  weak  and  electromagnetic  interactions; and the  expansion of space  and  supercooling  of the still immensely hot universe due to  cosmic inflation , which is believed to have been triggered by the separation of the  strong  and  electroweak interaction . Tiny ripples in the universe at this stage are believed...

The chronology of the universedescribes the history and  future of the universe  according to  Big Bang cosmology. The earliest stages of the universe's existence are estimated as taking place 13.8  billion years  ago, with an  uncertainty  of around 21 million years at the 68% confidence level.