A representation of the evolution of the universe over 13.77 billion years. The far left depicts the earliest moment we can now probe, when a period of ’inflation’ produced a burst of exponential growth in the universe. (Size is depicted by the vertical extent of the grid in this graphic.) For the next several billion years, the expansion of the universe gradually slowed down. More recently, the expansion has begun to speed up again.
A representation of the evolution of the universe over 13.77 billion years. The far left depicts the earliest moment we can now probe, when a period of 'inflation' produced a burst of exponential growth in the universe. (Size is depicted by the vertical extent of the grid in this graphic. For the next several billion years, the expansion of the universe gradually slowed down. More recently, the expansion has begun to speed up again. NASA's Goddard Space Flight Center Researchers study cosmic expansion using methods from many-body physics / Article published in -Physical Review Letters- It is almost always assumed in cosmological calculations that there is a even distribution of matter in the universe. This is because the calculations would be much too complicated if the position of every single star were to be included.
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