The Big Bang is the name for the reading theory behind the birth of everything atoms, light, gravity, gases, stars, planets, galaxies and even time itself. And while scientists have found plenty of evidence to backup The Big Bang theory the name itself isn’t entirely accurate. The universe didn’t begin with a bang (sound didn’t exist yet) or even a mighty explosion (fire and matter didn’t exist either) even light was relatively rate addition to the cosmic chronology. Confused?Here’s a guide to house and think it all began.
In the beginning
A long time ago, time didn’t even exist. neither did space. And in this nothingness hung a supremely hot spot crammed with all the raw ingredients of the universe crunched into a point 1000 times smaller than the period in the end of this sentence. Called "singularity", this is spot might even have been smaller than an atom, the basic unit of matter. But it wasn’t an atom because atom didn’t exist yet.
A trillionth of a trillionth of a second later
Suddenly, the supremely hot, scrunched up singularity doubles in size, and then doubles again, and then again, at least 90 times, in a process known as inflation. This is the bang in the Big Bang and it gets bigger. Expanding faster than the speed of light, this growth spurt defies the laws of physics. Everything in the universe explodes into existence, but at this point it’s little more than a mess of formless heat.
One second later
Inflation ends one millionth of a second after the start of The Big Bang. At just one second old, the newborn universe contains natures fundamental forces, including the gravity that keeps your feet on the ground and magnetic attraction.
3 minutes later
Expansion continues. Protons, neutrons, and electrons the itty bitty components of atom collide and interact to form a sort of super heated fog, but this mess is too hot to allow atoms to form or even light to shine.
400000 years later
The hot mess cools enough four sub atomic electrons to join protons and neutrons in the formation of hydrogen atoms, the most common element in the universe, and the stuff stars are made of. But stars didn't form yet. Universe continues its expansion in darkness.
400 million years later
Gravity slowly tugs at the cosmic clouds of hydrogen and helium, squishing them all together to form the first stars. This marks the end of universe dark age. The star cluster together and form galaxies, including our own Milky Way Galaxy.
6 billion years later
The first stars die and expel heavier elements that eventually form new stars and planets.
13.8 billion yearsPresent day
What’s the matter and energy created by The Big Bang continues to expand today. New stars form from the clouds of gas, old stars die and expel sooty clouds known as nebula. Planets orbit stars, stars orbits the center of the galaxies, and galaxies dance with each other. Humans ponder the clockwork of the universe, Just as you are doing now. Got confused. Let’s move to topics a it’ll less complicated than the birth of time and space.
What evidence do astronomers have for The Big Bang?
Plenty. In fact, they see evidence everywhere they look in the universe. In 1924, astronomer Edwin Hubble noticed the the galaxies outside the Milky Way Or home Galaxy, were zipping away in all directions, as if they originated from a singularity. Astronomers also see the big bang's baby pictures in a cosmic crackle of microwave energy and special ripples in gravity, both evidence of that information that gave birth to the universe. The amount of hydrogen, helium, and other elements across the universe all measure up to The Big Bang model. Astronomers have also failed to find any stars older than 13.8 billion years, the approximate age of the universe.
What existed before The Big Bang?
The short answer: nothing, nada, zip. But scientists still wonder if something existed before all the nothing. One theory, or universe is caught in an endless loop of explosions and crunches. Eventually, in billions and billions of years, the iron grip of gravity with slow the growth of the universe, stall it, and then pull everything back towards its center, A process that astrophysicist call big crunch.Planets, stars, and galaxies will slowly collapse back into the singularity that started it all kicking off another Big Bang and a brand new universe. According to another theory, or universe is just of many many, many alternate universes just like in a vast multiverse. When two of these universes interact at the quantum level(a level smaller than an atom),it kicks off a Big Bang and the birth of yet another alternate universe.
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