User blog:ShieldsPlus/Big Bang

Explanation
To quote from Wikipedia The Big Bang is the cosmological model of the universe, originally conceived to describe its origins, that is best supported by all cosmological observations. The essential idea is that the universe has expanded from a primordial hot and dense initial condition at some finite time in the past and continues to expand to this day.

This video explains the concept in detail. Notes on the video are listed below. (image below) Important: If there is an infinite amount of space to begin with, said space can be scaled down/shrunk into miniscule proportions and yet you would still end up with infinite amount of space. Important: Space does not need anywhere to expand into because it is able to expand into itself and still have extra space remaining.
 * Physicists used to think that the universe had existed forever, as this was what was suggested via observations of the night sky.
 * George Lemaître, a scientist proposed a new scientific viewpoint, states that the universe did indeed have a beginning.
 * Experimental evidence from Edwin Hubble was factored in, showing that the universe was expanding. Combined with the mathematics of general relativity allowed Lemaitre to calculate, observing that the farther one goes back in time, the smaller the universe was in terms of size.
 * Conclusion of said experiment was that everything that was to be seen in the universe was at one point in time, they were all located at one point in space. This idea was proposed as the "Primeval Atom" (We now call this the Big Bang Theory.)
 * Common misconceptions about the Big Bang is that it implies that the entire universe was compressed into a single point, from which it then expanded outwards to its surroundings.
 * The observable universe, which is part of the entire universe that is visible from Earth was at one point was condensed into an extremely small space. That extremely small space, however, was not a single point, nor the rest of the entire universe was contained inside that exact space.
 * Current data shows us that the actual size of the universe may be bigger than previously thought, as recent discoveries have observed that there are more galaxies compared to the previous estimate.
 * This page notes that instead of 100 to 200 billion galaxies, there are at least two trillion galaxies that exist.
 * The vid also says that the actual universe is 20x larger (lower bound), if not leaning towards infinite. There doesn't seem to be a source for this other than the above point where the universe could be 20 times larger in volume due to it containing 20 times as many galaxies compared to previous estimates.

Something Extremely Strange
This section of the page covers the latter half of the Youtube video, where the explanation & description starts to get extremely strange. Starting at 2:10 in the video...

And yes, this is what is actually said in the video.
 * The "Big Bang" was basically a time long ago when was space was much more squeezed together. The observable universe was at that point, was crammed into a tiny piece within that space.
 * At 2:25, the video states that the entire universe in its early stages was decribed to be dense, as well as extremely hot . It also states that the shape of said universe was said to be curved everywhere. Said curvature then manifested as a rapid expansion of space throughout the universe.
 * The Big Bang Singularity, where everything in the universe started from a single point, is also incorrect. This is because

Credit to minutephysics for this information.

Representation in Fiction

 * Portrayed as a massive explosion that was said to have created the existing universe.
 * Usually doesn't specify whether the concept of time was created alongside the creation of the universe.
 * Notably, due to the recent information in regards to the Big Bang and the expansion of space where

To be continued :/