Death of the universe VideoHow Will the Universe End? - Space Time death of the universe
The chronology of the universe describes the history and future of the universe according to Big Bang cosmology. The earliest stages of the universe's existence are estimated source taking place For the purposes of this summary, it is convenient to divide the chronology of the universe since it originatedinto five parts.
It is generally considered meaningless or unclear whether time existed before this chronology:. It includes the Planck epochduring which currently understood death of the universe of physics may not apply; the emergence in stages of the four known fundamental interactions or forces —first desthand later the electromagneticweak and strong interactions; and the expansion of space itself and supercooling of the still immensely hot universe due to cosmic inflation.
Tiny ripples in the universe at this stage are believed to be the basis of large-scale structures that formed much later.
Different stages of the very early universe are understood to different extents. The earlier parts are beyond the grasp of practical experiments in particle physics but can be explored through other means.
Lasting aroundyears. Initially, various kinds of subatomic particles are formed in stages.
These particles include almost equal amounts of matter and antimatterso most of it quickly annihilates, leaving a small excess of matter in the universe. If primordial black holes exist, they are also formed at about one second of cosmic time.
By 20 minutes, the universe is no deaty hot enough for nuclear fusionbut far too hot for neutral atoms to exist or photons to travel far. It is therefore an opaque plasma. At around 47, years,  as the universe cools, its behaviour begins to be dominated by matter rather than radiation.]