What existed before the singularity?

The universal origin story known as the Big Bang postulates that, 13.7 billion years ago, our universe emerged from a singularity — a point of infinite density and gravity — and that before this event, space and time did not exist (which means the Big Bang took place at no place and no time).

What happened to the singularity from which the universe has started?

The Big Bang theory says that the universe came into being from a single, unimaginably hot and dense point (aka, a singularity) more than 13 billion years ago. It didn’t occur in an already existing space. Rather, it initiated the expansion—and cooling—of space itself. Why stand behind this theory?

How long did it take for the a single to atom to expand into a Universe?

It takes us from a hot, plasma-filled Universe to an almost-equally-hot Universe filled with 100\% neutral atoms. Although we say that the Universe formed these atoms 380,000 years after the Big Bang, this was actually a slow, gradual process that took about 100,000 years on either side of that figure to complete.

What was the only item that originally existed in the universe?

The first elements — hydrogen and helium — couldn’t form until the universe had cooled enough to allow their nuclei to capture electrons (right), about 380,000 years after the Big Bang. Q: How did the first chemical element appear in the universe?

How did the singularity come into existence?

The initial singularity was the gravitational singularity of infinite density thought to have contained all of the mass and space-time of the Universe before quantum fluctuations caused it to rapidly explode in the Big Bang and subsequent inflation, creating the present-day Universe.

How do scientists know that the universe is expanding?

Answer: Astronomers observe a regular progression of galaxies which are expanding at progressively higher velocities as they measure galaxies at increasing distances. What they measure then is an expansion of the universe at both relatively recent times in addition to the early phases of the universe’s evolution.

What created the singularity?

When did the universe become an infinite singularity?

If you keep going back and back, then (in the Old Big Bang model, before we knew about inflation) you find that at a sufficiently early time, 13.7 billion years ago, the density, temperature and expansion rate start off as infinite. That’s a singularity!

Could the whole universe have gone singular at once?

No, actually. First, a singularity is not necessarily something that happens at a point in space. It can occur at a moment in time, and it can occur across an entire region — including, potentially, the entire universe. So the whole universe could have gone singular at the same moment.

What is a spacetime singularity and why is it important?

A spacetime singularity is a breakdown in spacetime, either in its geometry or in some other basic physical structure. It is a topic of ongoing physical and philosophical research to clarify both the nature and significance of such pathologies.

What is the chronology of the universe in physical cosmology?

Physical cosmology. 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 as taking place 13.8 billion years ago, with an uncertainty of around 21 million years at the 68\% confidence level.