What is a prominent physical property of the Andromeda Galaxy?

The Andromeda Galaxy is indeed known for being the nearest spiral galaxy to our own Milky Way. This proximity, at about 2.537 million light-years away, makes it an important object of study for astronomers. Its closeness allows for detailed observation and has led to significant research about galactic formation and evolution. Understanding the interactions between the Milky Way and Andromeda is also crucial since they are on a collision course, projected to merge in several billion years.

The other choices do not accurately represent the characteristics of the Andromeda Galaxy. It is not the largest galaxy in the universe, nor does it have a completely elliptical shape, as it is classified as a spiral galaxy. Additionally, Andromeda contains billions of stars, making the claim that it contains no visible stars incorrect. This galaxy's distinct spiral structure, along with the vast number of stars and other celestial phenomena, contributes significantly to its prominence in the night sky and in astronomical studies.