“As I recall - the new telescope showed that there were a lot more galaxies then previously understood. Which would mean that they have to recalculate all of the Dark Matter stuff.”
That’s not correct. Dark matter is about interactions within galaxies and their close neighbors. It’s not about the total mass of the universe so more galaxies doesn’t have an impact.
Yep. Dark matter was conceived to explain how galaxies could ever form and interact the way they do given that not only is the universe expanding but expanding at an exponentially increasing rate. They posit that there is a massive amount of invisible matter providing the gravitational forces to accomplish this.