Thank you for the reply. I guess I have trouble visualizing the motion of stars in a spiral galaxy. My understanding of BBNH postulates dark matter as a fudge factor to explain why galaxy arm rotation isn’t as expected, based on Big Bang physics. BBNH then suggests plasma filament formation as the explanation. I just wonder if they have blinders on searching for the dark matter to support their Big Bang assumption, and not looking at plasma physics with an open mind. Can you shed light on the current state of advancing the plasma physics explanation?