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Ranku
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How different would the universe look without dark matter? Would galaxies have formed, allowing for the existence of the solar system and life?
With only visible matter, radiation, and cosmological constant present.Orodruin said:It is not sufficient to just say "without dark matter" because that does not specify what other things (if anything) you put into the Universe instead.
Still not sufficient. You need to specify proportions.Ranku said:With only visible matter, radiation, and cosmological constant present.
I guess the present proportion would be visible matter 5 % and dark energy 95 %.Orodruin said:Still not sufficient. You need to specify proportions.
You can try this one http://www.astro.ucla.edu/~wright/CosmoCalc.htmlRanku said:I guess the present proportion would be visible matter 5 % and dark energy 95 %.
Dark matter is a hypothetical form of matter that is believed to make up about 85% of the total mass of the universe. It does not emit or absorb light, making it invisible to telescopes and other instruments. Its existence is inferred through its gravitational effects on visible matter. Without dark matter, our current understanding of the universe and its structure would be incomplete.
There is currently no direct evidence for a universe without dark matter. However, some scientists have proposed alternative theories, such as modified gravity, to explain the observed phenomena that are typically attributed to dark matter. These theories have not been widely accepted and do not fully explain all of the evidence for dark matter.
If dark matter did not exist, the gravitational effects it has on visible matter would not be present. This would result in a different distribution of matter and different structures in the universe, such as galaxies and galaxy clusters. Additionally, the current understanding of the expansion of the universe and the formation of large-scale structures would need to be revised.
If dark matter did not exist, it would have significant implications for our understanding of gravity and the laws of physics. It could also have implications for the search for dark matter particles, as well as the development of theories and models to explain the structure and evolution of the universe.
Scientists are continuously conducting experiments and observations to search for evidence of dark matter. If a universe without dark matter were to be proven, it would require significant revisions to our current understanding of the universe. This could potentially be achieved through further studies of the behavior of gravity on large scales and the development of new theories and models to explain the observed phenomena.