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Threshold I: The Beginning

BIGHISTORY

A Journey from The Big Bang to the First Atoms

A Journey from The Big Bang to the First Atoms

bighistory.in

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RICHARD FEYNMAN

“Nature uses only the longest threads to weave her patterns, so that each small piece of her fabric reveals the organization of the entire tapestry.”

The Big Bang

Consider something unbelievably tiny, unbelievably dense, and incredibly hot. Then, suddenly, space, time, and all molecular matter burst in ways that no words can express. What is known is that the Universe expanded at an unfathomable rate in a fraction of a second. Some recognised subatomic par...

10e-36 seconds after The Big Bang

The universe expanded at an inconceivable speed, from far less than an atom to enormous size. 

The fundamental forces: Gravity (the force that...

The expansion had relatively slowed down. Due to quantum fluctuations subatomic particle like quarks were formed which were the building blocks of protons and neutrons. Quarks and antiquarks formed and annihilated each other. The remaining quarks accounted for on...

1 second after the Big Bang

Electron-positron pairs were created and annihilated, leaving 1/billionth the amount of electrons and positrons behind.

Nuclei

10 seconds after The Big Bang

Quarks combined to generate protons and neutrons. Two up quarks and one down quark make up a proton, while one up quark and two down quarks make up a neutron.

As the universe cooled, these neutrons and protons combined further to form hyd...

Plasma

3 minutes after The Big Bang

The universe consisted of plasma (superheated state of ordinary matter) of nuclei, electrons, and photons; temperatures were too high for electrons to attach to the nuclei. Because photon...

Atoms

3,77,000 years after The Big Bang

As the universe expanded, plasma grew cooler and cooler. The universe cooled down further to 3000 K, making it possible for the nuclei in the plasma to gain electrons and become full-fledged neutral Hydrogen and Helium atoms.

Cosmic Microwave Background

3,80,000 years after the Big Bang

Photons of light tangled in the plasma could now move freely and were released. The universe became transparent for the first time. This is known as cosmic microwave background that we can see even today.

Explore What's Next?

Formations of First Stars

https://bighistory.in/formation-of-stars-timeline/

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Threshold II: Formation of the First Stars

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