I’ve always thought that many Galaxies look like they are “spiraling down the drain”
Look at your sink, bathtub, toilet, Whirlpoole, tornadoes, hurricanes, Great Red Spot...
Galaxies exploding outward would look more like a ball. We have (and many other galaxies have) spiral arms.
It appears we are also going down the drain in a few billion years!
That is correct.
The center of each galaxy is a huge black hole that will eventually consume each galaxy and eventually even each other.....................then................BANG!........it begins again................