I Do we need Dark Matter or are we just time blind

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The discussion centers on the interpretation of astronomical observations and the potential implications for dark matter. It argues that gravitational time dilation affects how we perceive the velocities of stars, particularly those near massive objects like black holes, leading to potential miscalculations of their actual speeds. Critics assert that the effects of time dilation are minimal and cannot account for the discrepancies observed in galaxy rotation curves, which support the existence of dark matter. The conversation highlights the need for accurate measurements and corrections for time frame differences to avoid distorted views of the universe. Ultimately, the prevailing consensus remains that dark matter is necessary to explain various astronomical phenomena.
  • #31
The baryon mass fraction of the universe has been measured with great precision by a number of studies [Planck, WMAP, BAO] which rules out any significant unaccounted contributions from black holes. For further discussion see https://ned.ipac.caltech.edu/level5/Peebles2/P5_2.html
 

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