A description of the big bang which created the universe

Second, galaxies appear to be moving away from us at speeds proportional to their distance. In almost all cases, the spiral galaxies were observed to be moving away from our own. Origins In the first moments after the Big Bang, the universe was extremely hot and dense.

A few minutes into the expansion, the period known as Big Bang nucleosynthesis also began. As the CMB expanded, it gradually lost density and energy, and is currently estimated to have a temperature of 2.

evidence of the big bang theory

If so, some scientists reasoned that if you rewound the Universe's life then at some point it should have existed as a tiny, dense point. General relativity's equations suggested an initial speck of unlimited heat and density — a singularity.

A description of the big bang which created the universe

There were no stars or planets. The theory suggests that in that first big push of inflation, different parts of space-time grew at different rates. At some point in the past, he argued, the entire mass of the universe would have been concentrated into a single point from which the very fabric of space and time originated. The details of this process depend on the amount and type of matter in the universe, with cold dark matter, warm dark matter, hot dark matter, and baryonic matter being the four suggested types. Many researchers await more precise CMB measurements that could kill, or validate , the many inflation models that still stand. Very gradually, collisions between these black holes would result in mass accumulating into larger and larger black holes. This all began roughly Today, the consensus among scientists, astronomers and cosmologists is that the Universe as we know it was created in a massive explosion that not only created the majority of matter, but the physical laws that govern our ever-expanding cosmos. If so, some scientists reasoned that if you rewound the Universe's life then at some point it should have existed as a tiny, dense point. While experimentalists strive for new levels of precision, some theorists have turned away from inflation to seek other ways to squash the universe flat. Prior to the singularity, nothing existed, not space, time, matter, or energy - nothing.

XDF view — each light speck is a galaxy — some of these are as old as This graphic shows a timeline of the universe based on the Big Bang theory and inflation models.

According to the many experts however, space didn't exist prior to the Big Bang.

big bang explosion
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The origins of the universe facts and information