Question

Why Big Bang Happened?

Answer 1

one of the mystery or the secret of the cosmos is what caused or triggered the Big Bang or how universe was made if physics states that energy and matter can not be created nor be destroyed. this mystery still lie at the heart of space time. No thing great is created suddenly, any more than a bunch of grapes or a fig. If you tell me that you desire a fig, I answer you that there must be time. Let it first blossom, then bear fruit, then ripen.so how was the universe created?.
one assumption which I can made is that a sudden quantum fluctuation in the energy density in singularity caused or triggered the Big Bang and after that universe start expanding and expanding and it is still expanding though I don't believe that universe is expanding. so your answer is quantum fluctuation in energy density caused big bang. and that was the cosmic origin and the beginning of time and space both can not be independent with each other because time is not responsible for causality rather causality is responsible for time (my favorite dialogue) .big bang happened because there is a rule of nature which is known as quantum fluctuation in energy density.


another assumption There is no answer to that question because it is based on an erroneous asumption, that is that life has a beginning. In our daily life we are used to the fact that everything have a beginning and thus also an end. So we tend to project this experience also to the totality, the universe, and to life it self. The universe is eternal because otherwise it must have been created out of nothing, and since something can not come from nothing, the logical conclusion is that the universe has always existed. And since something can not become nothing it is also obvious that universe must contiune to exist in eternity.

hope it will fulfill your thrust

Answer 2

Answer:

The simplest way to explain the Big Bang Theory-- it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today. The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now (and it could still be stretching). In 1927, an astronomer named Georges Lemaître propounded the theory of the Big Bang. He said that a very long time ago, the universe started as just a single point. He said the universe stretched and expanded to get as big as it is now, and that it could keep on stretching.

This theory explains how our universe began. About 14 billion years ago, all the matter that makes up the universe was squashed into an incredibly small space. Because the matter was so condensed, it wasn’t in any form we would recognize today. No atoms, or even particles. Suddenly, though, that matter went through a rapid inflation — an explosion, in a way. That’s the Big Bang. The result was a super-hot mass of matter, including light and charged particles such as protons and electrons. The matter cooled slowly over billions of years. As it cooled, it formed elements such as hydrogen. The matter also began to clump together into stars and planets. At the same time, the universe kept on cooling and expanding. In fact, the universe is still cooling and expanding today.

The Big Bang theory represents cosmologists' best attempts to reconstruct the 14 billion year story of the universe based on the sliver of existence visible today.

The Big Bang can also refer to the birth of the observable universe itself — the moment something changed, kickstarting the events that led to today. Cosmologists have argued for decades about the details of that fraction of a second, and the discussion continues today.