Alternatives to Dark Matter hypothesis
Our Milky Way is a spiralling Galaxy containing 100-400 billion stars, with a stellar disk diameter of approximately 150,000-200,000 light-years and depth of 2000 light-years.
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Baryonic Acoustic Oscillations
Soon after the big bang, followed by inflationary epoch, the universe was in a hot plasmonic state containing a mixture of radiation and baryons. The universe being in this fluid state made it possible for the pressure waves to travel. So, the universe had baryons and environment to support acoustic oscillations.
