Photo de stock - Expansion of the universe Stage 2. Illustration of Friedmann´s Big Bang theory. According to Friedmann, who studied Einstein´s equations. The matter is concentrated into a single point, then begins a phase of expansion and finally collapses. See the

Photo de stock: Expansion of the universe Stage 2. Illustration of Friedmann's Big Bang theory. According to Friedmann, who studied Einstein's equations.

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