2.) Yes, and is it really true that the universe is flat?
Unfortunately, knowing about the universe is a much worse case than the goldfish's knowledge of the world outside the glass, there is a lack of understanding for the whole, thinking in 3 dimensions is difficult for us, with the 4- ten completely suspends it. Science is like religion, one must not forget that not too long ago the earth was flat too. Lo and behold, it is now round. A miracle a miracle!
The theory that the universe is flat is based on knowledge and measurements of the cosmic background radiation, the large-scale distribution of galaxies and other astronomical observations. This theory is an important part of the Standard Cosmological Model, which describes how the universe has evolved since the Big Bang.
A flat universe means that the geometry of the universe largely follows the laws of Euclidean geometry as we know them from everyday life. In a flat universe, the total mass (including dark matter) and energy density are exactly the critical value needed to keep the universe from collapsing or drifting apart indefinitely.
Why do people believe the universe is flat? Here are some reasons: Observations of the cosmic background radiation:
The detailed study of the cosmic background radiation, which is a kind of "imprint" of the Big Bang, has shown that the temperature fluctuations of this radiation can best be explained in a flat universe.
Large-scale distribution of galaxies:Observations show that the distribution of galaxies in the universe best fits a flat model. In a curved universe, the patterns of galaxy distribution would behave differently.
Baryon fluctuations: The patterns of baryon fluctuations in the cosmic background radiation and the distribution of galaxies are consistent with a flat universe.
However, it is important to note that the term "flat" in this context does not mean that the universe is actually flat as a sheet of paper. It means that the critical density of the universe is approximately reached, so that the expansion of the universe is in equilibrium and does not result in either collapse or infinite expansion.
Info:
Nevertheless, the question of the precise geometry of the universe and the nature of its dark energy and dark matter remains an active area of research in cosmology. New observations and findings could further refine or change our ideas about what the universe is really like.
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