As an expert in astrophysics, I can tell you that the concept of the "biggest star in the universe" is a bit misleading. Stars are categorized by their size, mass, and brightness, but the "biggest" can refer to different characteristics. If you're referring to the most massive, the current title holder is R136a1, located in the Tarantula Nebula of the Large Magellanic Cloud. However, if you mean the largest in terms of volume, the title goes to UY Scuti, although measurements are subject to change as new data comes in.
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