Finally, even earlier, in the very distant past, there was a moment when, according to the theory of the density of matter is equal to the formal infinity. This is the beginning of the expansion. Status of the universe at that time was called the singularity. How long ago began the expansion of the universe? The calculation is based on the observed rate of recession of galaxies, showing that it happened about 15 billion years ago. What happened then, and that was before? What are the properties of space and time near the singularity? This puzzle mysteries of our universe.
William Harvey: the Man, the Physician and the Scientist
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