Spiral galaxies are named for the arms curling outward from a central core of stars and gas. All of them have some sort of bulge at the center, but some, perhaps 20 or 30 percent, have this strange type of boxy or peanut-shaped bulge.
Spiral galaxies are named for the arms curling outward from a central core of stars and gas. All of them have some sort of bulge at the center, but some, perhaps 20 or 30 percent, have this strange type of boxy or peanut-shaped bulge.