Origin of Universe: Big Bang Theory

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A Belgian priest named Georges Lemaître first came up with the fact that the big bang theory in the 1920s, when he theorized that the universe began from a single primordial atom. The idea gained major boosts from Edwin Hubble’s observations that galaxies are moving away from us in all directions, as well as from the 1960s discovery of cosmic microwave radiation as acknowledged as echoes of the big bang by Arno Penzias and Robert Wilson. Further work has assisted clarify the big bang’s tempo.

The Big Bang theory is the exceptional cosmological model explaining the existence of the observable universe from the earliest known periods through its subsequent large-scale evolution. The model states how the universe expanded from an initial state of high density and temperature, and provides a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background (CMB) radiation, and large-scale structure. Technically, the theory sways with Hubble–Lemaître law an the observation that the farther away a galaxy is, the faster it is moving away from Earth. Extrapolating this cosmic expansion backwards in time popularly known as laws of physics. The theory states an increasingly concentrated cosmos preceded by a singularity in which space and time lose meaning ,typically named “the Big Bang singularity”. Detailed measurements of the expansion rate of the universe place the Big Bang singularity estimated at around 13.8 billion years ago, which is thus considered the age of the universe. The best-supported theory of the universe’s origin focuses on an event known as the big bang. The theory was elucidated of the observation that other galaxies are moving away from our own at great speed in all directions, as if they had all been driven by an ancient explosive force

The Theory:

The theory in the first 10^-43 seconds of its existence, the universe was very intact, less than a million billion billionth the size of a single atom.
It’s idea that at such an incomprehensibly dense, energetic state, the four fundamental forces—gravity, electromagnetism, and the strong and weak nuclear forces—were forged into a single force, but the current theories haven’t yet figured out how a single, unified force would work. To pull this off, we’d need to know how gravity works on the subatomic scale, but we currently don’t.
It’s also believed that the extremely close quarters allowed the universe’s very first particles to mix, mingle, and settle into roughly the same temperature
Later in an unimaginably small fraction of a second, all that matter and energy expanded outward more or less evenly, with tiny variations provided by fluctuations on the quantum scale.
The model of breakneck expansion, called inflation, may explain why the universe has such an even temperature and distribution of matter.
After inflation, the universe continued to expand but at a much slower rate. It’s still unclear what exactly powered inflation.

Cosmic Inflation

As time passed and matter cooled, more diverse kinds of particles began to form, and they eventually condensed into the stars and galaxies of our present universe.

By the time the universe was a billionth of a second old, the universe had cooled down enough for the four fundamental forces to separate from one another. The universe’s fundamental particles also formed. It was still so hot, though, that these particles hadn’t yet assembled into many of the subatomic particles we have today, such as the proton. As the universe kept expanding, this piping-hot primordial soup—called the quark-gluon plasma—continued to cool. Some particle colliders, such as CERN’s Large Hadron Collider, are powerful enough to re-create the quark-gluon plasma.

Radiation in the early universe was so intense that colliding photons could form pairs of particles made of matter and antimatter, which is like regular matter in every way except with the opposite electrical charge. It’s thought that the early universe contained equal amounts of matter and antimatter. But as the universe cooled, photons no longer packed enough punch to make matter-antimatter pairs. So like an extreme game of musical chairs, many particles of matter and antimatter paired off and annihilated one another.

Somehow, some excess matter survived—and it’s now the stuff that people, planets, and galaxies are made of. Our existence is a clear sign that the laws of nature treat matter and antimatter slightly differently. Researchers have experimentally observed this rule imbalance, called CP violation, in action. Physicists are still trying to figure out exactly how matter won out in the early universe.

Building Atoms

Within the universe’s first second, it was cool enough for the remaining matter to coalesce into protons and neutrons, the familiar particles that make up atoms’ nuclei
After the first three minutes, the protons and neutrons had assembled into hydrogen and helium nuclei. By mass, hydrogen was 75 percent of the early universe’s matter, and helium was 25 percent.
The abundance of helium is a key prediction of big bang theory, and it’s been confirmed by scientific observations.
Despite having atomic nuclei, the young universe was still too hot for electrons to settle in around them to form stable atoms.
The universe’s matter remained an electrically charged fog that was so dense, light had a hard time bouncing its way through. It would take another 380,000 years or so for the universe to cool down enough for neutral atoms to form—a pivotal moment called recombination.
The cooler universe made it transparent for the first time, which let the photons rattling around within it finally zip through unimpeded.
We still see this primordial afterglow today as cosmic microwave background radiation, which is found throughout the universe.
The radiation is similar to that used to transmit TV signals via antennae. But it is the oldest radiation known and may hold many secrets about the universe’s earliest moments.

From the first stars to today

There wasn’t a single star in the universe until about 180 million years after the big bang. It took that long for gravity to gather clouds of hydrogen and forge them into stars.
Many physicists think that vast clouds of dark matter, a still-unknown material that outweighs visible matter by more than five to one, provided a gravitational scaffold for the first galaxies and stars.
Once the universe’s first stars ignited, the light they unleashed packed enough punch to once again strip electrons from neutral atoms, a key chapter of the universe called reionization.
In February 2018, an Australian team announced that they may have detected signs of this “cosmic dawn.”
By 400 million years after the big bang, the first galaxies were born. In the billions of years since, stars, galaxies, and clusters of galaxies have formed and re-formed—eventually yielding our home galaxy, the Milky Way, and our cosmic home, the solar system.
Even now the universe is expanding, and to astronomers’ surprise, the pace of expansion is accelerating. It’s thought that this acceleration is driven by a force that repels gravity called dark energy.
We still don’t know what dark energy is, but it’s thought that it makes up 68 percent of the universe’s total matter and energy. Dark matter makes up another 27 percent.
In essence, all the matter you’ve ever seen—from your first love to the stars overhead—makes up less than five percent of the universe.

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