A is for Asteroid

One of the more peculiar phenomena in our universe is the bizarre asteroid belt surrounding Cygnus 7B.
Every asteroid appears to be shaped like a letter of the alphabet.
The upper-case block letters tumble and roll in a massive cloud. Sometimes they collide, pulverizing each other completely.
Scientists are baffled by this curious sight and have yet to offer any meaningful explanation for it.
Industry has shown no interest beyond tourism, since the asteroids contain no useful materials beyond compounds that are common planetside.
Military uses are frequent. Just aim, accelerate, and laugh.
“X marks the spot,” you could say.