This is how big Andromeda actually would be in our night sky if it were brighter. Its light took two million years to get here. It’s moving in our direction at 245,000 miles per hour, and in 3.75 billion years, it will arrive and collide with our own galaxy. There are some 400 billion stars there. If there is an intelligent being that is lookup up in the night sky in our direction right now, they would see us as we were two million years ago. Our ancestors just started walking upright.