Answers in Genesis has written an article about the spiral galaxy argument. This is the article: https://answersingenesis.org/astronomy/cosmology/galaxies-unexplained-spirals/
This article is also written by Danny Faulkner.
In the article they say, “Most astronomers currently think that this dark matter may allow galaxies’ spirals to survive. However, the best evidence for dark matter—the higher-than-expected rotation of the outer portions of galaxies—may actually make the winding problem worse, not better.”
I cannot understand why they say this. Why does dark matter make it worse? I am simply confused by their argument.
Besides, this article: http://www.astronomy.com/news/2013/04/new-insights-on-how-spiral-galaxies-get-their-armsstates that says, “The spiral arms are self-perpetuating, persistent, and surprisingly long-lived.” The article also says, the spiral arms of galaxies, “can exist on their own through (the influence of) gravity, even in the extreme when the perturbations are no longer there.” So based off this research, spiral galaxies could survive on their own without dark matter. Correct?
The Answers in Genesis article also says: “Another wrinkle has developed in recent years. Astronomers have photographed very distant galaxies, about 12 billion light-years away. Assuming, for the sake of argument, a big bang happened 13.7 billion years ago, these galaxies are among the youngest in the universe. Though they differ subtly from nearby (and presumably older-appearing) galaxies, they appear otherwise identical to them. In other words, little evolution has occurred.”
Is this true? If so, why has no evolution occured?