It doesn’t seem possible that galaxies could collide and have few stars do so. But when one realizes the distances, they are mind boggling. If our sun was the size of a green pea Pluto would be 100 yards away. The nearest star, Proxima Centauri, would be 125 miles away. The universe is mostly empty space
“The universe is mostly empty space”
Yep and I remember this little tib bit,
If the proton nucleus of a hydrogen atom were the size of a golf ball, the electron would be orbiting almost a mile away! That’s why we say atoms are mostly empty space!
So is all matter in the Universe. Your body, for example, is mostly empty space on the atomic level.