As an expert in astrophysics, I can tell you that the largest structures in our galaxy, the Milky Way, are typically massive stars, but when we talk about the entire universe, the largest objects can be galaxies themselves or even galaxy clusters and superclusters. However, the biggest thing in the galaxy is a bit of a misnomer because it depends on what you're referring to. If you're talking about the largest single object, that title goes to the biggest stars, such as red supergiants like Betelgeuse or VY Canis Majoris. But if you're referring to the largest structures by volume, that would be the galaxy itself, which is composed of hundreds of billions of stars, planets, and other celestial bodies.

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For years, astronomers were convinced that a structure known as the Sloan Great Wall was the biggest-known structure in the universe. This vast cluster of galaxies and other cosmic matter is a mind-boggling 1.4 billion light-years across.read more >>