The Cosmic Tadpole
Above we see what can happen when massive objects like galaxies interact, and how that interaction can produce truly incredible sights. This is the Tadpole Galaxy, and at one point, it was a normal barred spiral galaxy, minding its own business, floating through the universe about 400 million light years away in the constellation Draco.
Somewhere along the way, it crossed paths with another galaxy, and after that we’ve only got speculation. The best idea is that their mutual gravity caused the companion galaxy to swing around the Tadpole, dragging millions of stars in its wake. The end result is the 280 thousand light-year-long tail, made entirely of stars, including several pockets of bright blue stars.
And yes, astronomers do prefer the name Tadpole, because the Sperm Galaxy would be an awkward thing to put in the history books. I would have done it, though. We have the Sperm Whale, so in my mind a whole galaxy would be much better. Dare to dream