Is This the Biggest Spiral Galaxy in the Universe?

Nature does love spirals. From the cream floating in your coffee cup to hurricanes to galaxies themselves, spirals form on a vast range of scales. They may be for different reasons (coffee and hurricanes have faster rotation in the center, winding up the arms, whereas galaxies form spirals from a more subtle and complex effect that acts like an interstellar traffic jam), but when you have stuff that spins, spirals can arise naturally. But how big a spiral can you get? Our Milky Way galaxy is pre...