Hello, I'm an expert in astronomy with a passion for exploring the vastness of the cosmos and the celestial objects within it. When it comes to the largest known stars, we're talking about some truly massive and fascinating celestial bodies.

As of my last update, the title of the biggest known star is often attributed to UY Scuti. This is a red supergiant located in the constellation Scutum. UY Scuti is estimated to be around 1,700 times the diameter of our Sun, which is a staggering size. However, it's important to note that measurements of such distant and massive objects can be challenging and subject to revision as new data and more precise methods of observation become available.

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VY Canis Majoris (VY CMa) is a red hypergiant star located in the constellation Canis Major. With a size of 2600 solar radii, it is the largest known star and also one of the most luminous known. It is located about 1.5 kiloparsecs (4.6��1016 km) or about 4,900 light years away from Earth.read more >>