re 1:14:00 They start discussing the 'voids', and I find it easiest to visualize this structure of filaments & clusters, rather as a slowly condensing foam like on your bath or dish water, where you have several big bubbles, and still some visible fluid lines & clusters of tiny bubbles at the film intersections of 2 or more big bubbles. The recent Hubble limit mapping shows it quite clearly if you have a rotatable 3D model. re 1:24:15 Shock heat of galactic collisions, is almost entirely gravitational. Since there is negligible actual body contact, and so called 'dark matter' is the main generator of that 'heat', and the perturbation of the trajectories of every visible body in the collision.
So the milky way is a blueberry and our universe is a big blueberry cake 🧁 But you know what happens to a cake when it has reached it's maximum expansion? Someone is going to eat it 😋
The thumbnail contains the title and the speaker. Two most important pieces of information when I pick which lectures to watch. I subscribe to plenty of science channels and I think this one is quite good at thumbnails and titles. The worst is CfA Colloquium. They name their lectures something like “CfA Colloquium Live Steam” every time.
The lecture stars at 13:49 Historical perspective 37:12 What is a galaxy 45:41 How to simulate 1:00:00 Simulation of the future of Milky Way 1:04:45 Summary and QnA