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there are a lot of theories about what existed before the big bang. Two-headed time theory, black hole, big bang, big bounce, and multiverse are some of them. Scientists think that in the near future humanity will be able to collect more info about this topic and get an understanding of the beginning.
Stephen hawking's theory says that nothing existed before the big bang. I think that theory might be true.
(There is no info about which theory you have found more plausible. You should have dug deeper into one of them giving your explanations.)

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So if we think in a more aristocratic method, there are mainly 2 options. 1) Nothing existed 2) Something existed. If option 1 is true, we cannot talk more about this subject so I will continue with option 2. If we continue from there, there are two more options. 1) Someone started the creation 2) it is randomly generated (like a minecraft world) there is not much to say about the second option so I will be continuing with option 1. This means there is a creator, a God. We have another two options. If there is a God, is he the ultimate being or is he just some big winged creature waiting to be defeated by a group of teenagers that understand the power of friendship (as you can see, I have the power of God and anime on my side). Options start to vary more from here on, but the general concept is like this.  (Wow, a philosophical way of thinking!)

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The theory I find the most plausible is that nothing existed before the Big Bang. “There was nothing around before the Big, Big Bang,” Hawking said. His theory is based on the assumption that the universe has no boundaries.

“The boundary condition of the universe ... is that it has no boundary.” According to Hawking, the laws of physics and time cease to function inside that tiny particle of heat and energy. The ordinary real time as we know now shrinks infinitely as the universe becomes ever smaller but never reaches a definable starting point. That is why I find this theory the most reasonable. (Short and sweet!)

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"Where am I actually at?" "Why am I here?" "What are time and universe?" These are questions that cannot be answered properly and which have various answers because of their uncertainty. Some suggested theories are the multiverse, black hole, and band big bang theories. The big bang theory is the one that is widely accepted, however with the recent research on quantum physics, the multiverse theory is getting accepted more. The multiverse theory suggests that our universe sprouted from another and there are many more parallel universes to ours, the cause being the obsolete problems of quantum mechanics.  I think since the multiverse theory is more interesting, and based on very recent research it sounds more plausible. (So, do you think "big bang" is the most plausible for you?)

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I think The Black Hole Theory is the most plausible option. Black Hole Theory assumes our universe is an output of a black hole in another galaxy. A black hole is a region of space having a gravitational field so intense that no matter or radiation can escape it while having so little mass. Knowing this, if we ask what would happen if the entire universe is compressed into a single point?  The answer is the same as it would be if you compressed any large-enough collection of mass or energy into a single point: it would form a black hole. I Big Bang happens with an extreme dense ball of cosmic matter forming and exploding, just like a black hole.  (There is no info about which theory you have found more plausible. )

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Newton tought that the universe was still and would stay still. Because there was nothing that changed around him which he could examine. So it was basically still. If you were living in Newton's time, you would think that humans allways existed. So if any of us lived at that time it would be the most plausible theory. (Most people wrote about Big Bang, I didn't want to do the same.)

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When Hawking proposed his theory about nothing existed before the universe started he stated that the cosmos had a shape of a shuttlecock. The shuttlecock shape has a zero point and it widens up from that point. They said that “Asking what came before the Big Bang is meaningless, according to the no-boundary proposal, because there is no notion of time available to refer to,”.  I believe in this idea because explaining a start is harder than believing that there is no start. Something starting with with a big explosion would make more sense to me.

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“Asking what came before the Big Bang is meaningless, according to the no-boundary proposal, because there is no notion of time available to refer to,”
I really like this quote. I think Stephen Hawking explained it really well. For me time is about change and the measurement of change. If there wasn't anything before the big bang or no universe we wouldn't have anything to record change of. There wouldn't be time because there would be no change, so maybe there was nothing before the big bang. (Short and sweet!)

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The theory that I found the most plausible is teh big bounce theory. This theory suggests that Big Bang is a result of a universe collapsing inwards. Big bang is when it expanded back and created a whole new universe. This means that there could be infinite universes, as they keep refreshing. So, accordingly to the Big Bounce theory infinity isn't universe based, time keeps on going but universes change. (Good, short and sweet!)

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I found the multiverse theory more plausible than the other because the multiverse theory explains that there are some more universes beyond the observable universe. It explains that inflation could happen over and over again, perhaps infinitely, creating a constellation of bubble universes. Not all of those bubbles will have the same properties as our own, they might be spaces where physics appears differently. Some of them might be similar to our universe, but they all exist beyond the realm we can directly observe. Shortly, it explains that we are not the only universe, making me feel like we are definitely not alone in the cosmos.(Ther e is no info about which theory you have found more plausible. )

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Black hole theory attracted me like it attracts matter. A black hole is a region of spacetime where gravity is so strong that nothing, no particles or even electromagnetic radiation such as light, can escape from it. The theory of black hole is that it attracts matter and gushes out our universe. (There is no info about which theory you have found more plausible. )

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There are quite a few theories on what was the state of the Universe before The Big Bang happened.  One of them is two-headed time, which suggests that a distorted twin of our Universe contracted and it reached its minimum size right before it started to expand. This theory seems more plausible than others because something omnipresent as time wouldn't be limited.

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We can't be sure about what happened before big bang. But we can guess, these are some of the theories made;

Multiverse: This theory suggests that our universe, with all its galaxies and countless stars, may not be the only one. Instead, there may be entirely different universes.

Two-Headed Time Theory: People who choose to believe in this theory sees the BB as sort of a pothole in the long road of time, with the future pointing away from that moment in two opposing directions

Nothing existed: Maybe nothing existed. We can never know. Is there a way to know for sure?
(There is no info about which theory you have found more plausible. )

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Two-Headed Time Theory:
This is a model advanced by Sean Carroll and Jennifer Chen as presented in their paper. This suggests that “Inflation occurs asymptotically both forwards and backward in time, implying a universe that is (statistically) time-symmetric on ultra-large scales.”   (There is no info about which theory you have found more plausible. )

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According to multiverse hypothesis, our universe, which spans tens of billions of light-years and contains hundreds of billions of galaxies and almost innumerable stars, may not be the only one. Yet, there may be a whole distinct universe, far away from ours, and then another, and another. I don't have sufficient knowledge to have an opinion, yet multiverse hypothesis look better in rationale than others. (Why do you think it is more plausible than the others?)

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Nothing Existed:(There was not a lot of stuff ) Before the Big Bang happened, an extremely dense ball of cosmic matter formed and it exploded. The explosion is referred to as Big Bang. This explosion (Inflation) created whole galaxies and planets. We can understand that the big bang is the whole inflation of this infinitely dense ball. We can easily understand that I have found that nothing existed and the big bang theory more plausible.(There is no info about which theory you have found more plausible. )

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The two-headed theory was a more plausible theory in terms of explaining the creation of the universe. The two-headed theory is a theory that explains the creation of the universe. It's similar to the fixed universe theory. In contrast, in the middle of the timeline the big bang happened and before the b.b. the universe shrunk to its minimum size and after the b.b it's started to expand.  (There is no info about which theory you have found more plausible. )