The Big Bang Documentary Mysteries of the Universe
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The Big Bang - according to modern concepts, the state of the expanding Universe in the past (approximately 13 billion years ago), when the average density of the Universe was a huge number of times higher than today. Due to expansion, the average density of the Universe decreases over time. Accordingly, as we move further into the past, the density increases, up to the point where classical concepts of space and time cease to hold (the cosmological singularity). This moment can be considered the beginning of time. The Big Bang period is conventionally defined as the time interval from 0 to several hundred seconds.