IC 1101 is a galaxy located 1.04 billion light years away from the Earth. It was discovered by William Herschel.
IC 1101 is an elliptical galaxy with a yellow color because it is an old galaxy, thus most stars in it are old (Post-)red supergiants or hypergiants. It is the largest galaxy known, the reason is because of the giant halo of light and hydrogen surrounding it, with a diameter approximately 4 million light years. That also makes it the largest singular object in the universe, yet the real galaxy (star extent) is only 212,000 light years in diameter. (smaller than the Andromeda Galaxy)