224, or NGC 224.
    Because Andromeda is near, many important discoveries have been made from studying it. In his 1944 study of the galaxy’s bulge, Walter Baade found that the stars there were quite different from those in the disk. Typically, older yellow and red giants near the end of their lives are found in the bulge, whereas younger hot blue stars are in the disk’s spiral arms. Andromeda has also helped astronomers appreciate the universe’s true size. Into the 1800s, what is now called the Milky Way was thought to be the entire universe. There were faint, fuzzy objects that were clearly not stars, but it was thought that these objects—Andromeda was one—were simply large, nearby clouds of gas that might someday