At the beginning there was nothing. Then suddenly space, matter and time appeared. The Big Bang theory is still one of the greatest mysteries of astronomy.
Most scientists believe that the universe began in the Big Bang about 14 billion years ago. At that time, the entire cosmos was at a tiny point, smaller than the pinhead. All of this was incredibly hot and denser than anything we could ever imagine. Suddenly from this point the universe as we know it arose. Time, space and matter began with the Big Bang. In a fraction of a second the universe has grown from less than one atom to a larger one than the galaxy! In 1924, Edwin Hubble caused a storm in the world of astronomy, announcing that galaxies are moving away from each other. So the universe expands like a balloon that is pumped. This meant that at first unimaginable force had to give impetus to start this expansion. The Big Bang was that force.
The universe expanded and cooled, energy changed into particles of matter and antimatter. More stable particles called protons and neutrons began to form when the universe was about one second. Over the next three minutes, the temperature dropped below 1 billion degrees Celsius. It got chilly enough that protons and neutrons could merge together to form hydrogen and helium nuclei. After 300,000 years, the cosmos cooled to about 3000 degrees. Atomic nuclei could ultimately capture electrons to form atoms. The universe was then filled with clouds of hydrogen and helium, from which eventually the first stars and galaxies formed.
The most convincing argument of the Big Bang is the existence of cosmic background radiation (microwave radiation). It fills the universe uniformly and we can register it in any direction in the sky. It is like the last remnant of the hot afterglow of the Big Bang. Currently, the cosmic background radiation cooling down all the time has reached just - 270 * C. Not much above absolute zero (Lowest possible temperature). On the cosmic background radiation map, slightly warmer areas of the universe show yellow and red. In contrast, dark blue places are cooler areas of matter from which galaxy clusters were formed. The Big Bang theory presents the origin of everything we know from a scientific point of view.
Greetings to lovers of Astronomy
Source: https://www.wikipedia.org/
All rights reserved by @astromaniac 2018
Thanks for the explanation of the big bang, I found your post to be very educating, there is a lot of people who think this didn't happen because they do not know the theory in depth. The truth is this is the best and simpler explanation at the observations made, and in science we always say that the simpler explanations tends to be the correct one.
Scinetist believe everything started with the big bang theory. OK
but what caused the big bang theory ?
why didn't it happen earlier ?
why did it happen here ?
Why didn't it happen somewhere else ?
what was before everything ? was there something ?
These are basically the questions that cause me to not get sleep at night
I know, there are many questions. This is a topic where science meets faith.
We don't know what caused it but we are working on it
Because there is no earlier, the big bang marked the beginning of time too (in this universe)
Since we don't know what caused we don't know the mechanism either although an explanation could be the collision between the membrane of our universe with another going by string theory
We are guessing it did happen somewhere else in the multiverse
You can say nothing since time (in this universe) began with the big bang
To be honest.
We will never ever know what EXACTLY happened.
unless something like this happens again (which would cause our death probably)
or we invent a time machine.
GREAT
more to think about
You are correct the truth is we might never know what really caused it we can just hypnotize about it. I hope someday someone would be able to demonstrate us the contrary.
"hypothesize" - though maybe all are hypnotized... :)
We will know what exactly happened as soon as we will have Grand Unified Theory. Time machine isn't required. Moreover that machine can't help us, because no particles can survive in enviroment with temperature above 10^14K.
"why did it happen here ?
Why didn't it happen somewhere else ?"
Because this happen everywhere in our Universe. Big bang could not happen somewhere else, because there wasn't/isn't somewhere else (so far).