What is the Andromeda galaxy made of?

The Andromeda galaxy, also known as M31, is primarily composed of stars, gas, and dust. The stars in Andromeda are mainly older, with some younger stars found in its spiral arms. The gas in the galaxy consists of hydrogen and helium, along with trace amounts of other elements. The dust in Andromeda is made up of tiny solid particles, which play a crucial role in the formation of new stars.