Imagine you have two hula hoops, one big and one small, and you put the smaller one on top of the bigger one. This is kind of what a polar-ring galaxy is like!
Polar-ring galaxies are really big stars in outer space that have a ring of stars and gas spinning around them, kind of like a big hula hoop. But here's the interesting part: that ring of stars and gas is spinning in a different direction than the rest of the stars in the galaxy!
It's like if you were playing catch with a friend, but you were throwing the ball one way and your friend was throwing it another way.
Scientists think that these polar-ring galaxies form when two galaxies get too close to each other and start to interact. The gravity between the two galaxies pulls material out, and it gets caught in a ring around the bigger galaxy.
Polar-ring galaxies are really cool because they are rare and unique, and they help us learn more about how galaxies form and interact with each other in space!