Dinosaurs roamed the Earth on the other side of the galaxy. (Yes, it's really true!)
https://www.businessinsider.nl/video-nasa-scientist-dinosaurs-milky-way-2019-10?international=true&r=US
I think it is rubbish and very misleading because the whole galaxy is rotating, every 250 million years, the video clip shows the sun rotating about the galaxy with the galaxy not rotating at all.
It is almost, but not quite, like saying that at night you are on the opposite side of the earth to where you were in the morning.
That's right: The Milky Way rotates with everything in it. However, the night sky was a completely different one, because all the stars also move and formed completely different constellations than we know today.