Explain the big bang theory
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The big bang theory explains how the universe began. Imagine the entire universe squeezed into a tiny, hot, dense space, like a balloon before you pop it. About 13.8 billion years ago, this area suddenly began to expand very rapidly—like rolling out of a tube. This expansion is what we call the Big Bang.
As the universe expanded, it began to cool. Imagine boiling water freezing. When hot, the particles did not stick together. But as it cooled, these particles began to combine into atoms. These atoms are like tiny building blocks for everything around us.
Over a long period of time, these atoms combined to form stars, planets, and galaxies—enormous collections of stars that can be seen in the night sky even now as the universe expands and galaxies move away from each other . . . .
Scientists have found evidence of the Big Bang by observing light from distant galaxies that appear to be expanded and red as if they were pulling on a rubber band They also observed traces of bright light, called cosmic microwave background radiation, which left in the Big Bang .
Simply put, the Big Bang theory tells us that the universe began with a small, hot explosion, and has been expanding and cooling ever since, creating everything we see today.
The most widely accepted explanation explaining the universe’s beginnings is the Big Bang theory.
The universe is expanding, according to data published by Edwin Hubble in 1920. Galaxies are getting farther apart with the passage of time. For instance, draw some points on the balloon; when it is blown, the points begin to drift apart. In the same manner, the universe is thought to be expanding because of the rising distance between galaxies. However, since the balloon’s marked points grow as well, this is only partially accurate. Scientists believe that even while there is a rising distance between galaxies, these observations do not support the idea that the galaxies are expanding.
The Big Bang theory states that:
All of the substance that makes up the universe was once contained in a single, minuscule ball with an infinitely small volume, infinite density, and limitless temperature.
13.7 billion years ago from the present Big Bang occurred. The tiny ball exploded violently and it is believed that the expansion continues even to the present day. The rapid expansion took place within fractions of a second after the bang and slowed down.
After around 300,000 years, the universe became transparent due to a drop in temperature that gave origin to atomic matter.
So according to the Big Bang theory, the universe began from a small point, and it has been expanding and changing ever since then, creating different matters of the universe.
Imagine the universe as a giant balloon. A long time ago, about 13.8 billion years ago, this balloon was incredibly tiny and dense, packed with all the energy and matter that would ever exist. Then, it started expanding—like blowing up a balloon.
At first, the universe was just a hot, dense soup of particles. As it expanded, it cooled down, allowing these particles to come together and form atoms. Over time, these atoms clumped together to form stars and galaxies, which then gave rise to planets, including Earth.
Think of it like a cosmic explosion, not in the sense of a fiery blast, but more like a massive, rapid stretching of space itself. This expansion continues today, which is why galaxies are moving away from us.
So, the Big Bang Theory essentially tells us that the universe has been growing and evolving from a single point of origin, and it’s still expanding and changing.