As an expert in astrophysics, I can tell you that the concept of the "biggest thing" in the universe is a bit tricky because the universe is constantly expanding and contains many massive structures. However, when we talk about the largest single objects, we often refer to galaxy clusters or superclusters, which are vast collections of galaxies bound together by gravity. The Sloan Great Wall is currently one of the largest known structures in the universe, but there are likely larger structures yet to be discovered due to the universe's vastness and the limitations of our observational capabilities.

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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 >>