What evidence is there of a Big Bang? Explain the theory cut and dry.
John C. New Hampshire
This is a good one, John. I was hoping it might be controversial, too, mainly to get attention but also to show people that people can discuss controversial topics without killing each other (we’ll see how that turns out).
The Big Bang Theory stands that the universe pretty much exploded out of a singularity, in which all matter, energy, and time was packed together. So it states the universe pretty much exploded out of nowhere. Don’t get the wrong idea, though. It wasn’t an explosion in time and space, it was an explosion of time and space. The beginning of everything you know.
Based on the General Theory of Relativity, the universe was infinitely small and hot. The earliest parts of the big bang can be speculated, but most models state that after the singularity inflated, extreme temperatures and pressures were exerted, and the universe was still rapidly expanding, and therefore cooling. All in a very small fraction of a second. Next, the universe grew exponentially larger. I won’t get into what the universe was made of, only that it consisted of elementary particles like quarks under extreme heat and pressure. And getting into details raises more questions, but all you want is an answer. Anyway, scientists think this happened 13.7 billion years ago.
What happened after that is widely speculated, but I won’t get into that for the same reason. What you should know is, theoretical physics is so strange and so confusing I refuse to try to understand some of it. I suggest the same, John, although you’re lucky you live in a world where people are free to choose their own cosmological model. There’s the big bang, in a nutshell.
You asked for evidence. Of course, nobody just said that all time and space exploded from nowhere. The main evidence we have of the Big Bang is something called red shift. Scientists use telescopes that detect light wavelengths. If something is moving away from us, it is shown as red. When something is moving closer to us, it is displayed blue. These phenomena are known as red shift and blue shift. Scientists detect all galaxies are moving away from each other, showing that all matter came from a single point.
The other point of evidence is leftover radiation. The universe was a weird place at first. Matter and energy had not yet settled, photons were bouncing everywhere, and the first atoms were just forming. So, I can only assume that left radiation and heat, and background radiation can be detected in outer space today, which most likely corresponds with scientists’ calculations.
The Big Bang Theory was first proposed in 1931 by a guy who realized that the reason galaxies were moving away from everything else was because the universe was expanding. Since then it’s been the leading cosmological model, and most people agree with it, although there are still arguments over alternative theories.
But let me tell you, this is way more difficult and complicated than I’m presenting to you. I already understood the theory, but for the more technical stuff I headed to the library, which I didn’t understand a lick of, so I left it out. That’s the Big Bang, but if you really want to understand it, I would forget about it and become a Creationist.