Big Bang![]() In the picture, the moment of the Big Bang, the light without being in that moment
The Big Bang was not an explosion in space, but a space where space itself began to expand. According to the theory, all matter, energy, space and time were initially at one extremely dense point.
In cosmology, we are not talking about a concrete point in space, but a situation in which the entire observable universe was squeezed into an extremely small space. This space was extremely hot (about 1010 °C) and infinitely dense. It was not located in any particular place, but the Big Bang occurred everywhere at the same time.
At the earliest stage (in fractions of the first second): The size of the universe was about one-tenth of a millimeter. More than 30 “early universes” would have been accommodated at the end of the pin.
Order of magnitude of the world: An estimate of modern cosmology: the observable universe has about 2 trillion galaxies. This is the latest and most widely approved estimate based on the deep descriptions of the Hubble and other telescopes, as well as statistical models.
A trillion = 1 000 000 000 000
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