Saw a post on Facebook shared by Malcolm Park. It referred to an article at Quanta Magazine entitled The Case Against Dark Matter, which documents how Erik Verlinde, a theoretical physicist at the University of Amsterdam, is proposing that gravity is a byproduct of quantum interactions. He says that extra gravity, that many attribute to dark matter, may be be an effect of dark energy.
Perhaps dark matter doesn't exist at all. Certainly we have not directly observed or detected it.
Jamie Flinn commented on Malcolm's post. He said, "Y'all thinking about it wrong way - you don't need dark matter or anything exotic... my theory is that lumpiness or large scale shape out side of our universe warp our spacetime time [like] a bedsheet covering a body, producing climes and slides on which our spacetime flows..."
I tend to agree. We're stuck in a rut.