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What is the biggest star in the universe?

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The largest known star is VY Canis Majoris [See related questions]

This is the largest star known to man, but there could possibly be far larger stars.
It is a red hypergiant in the constellation Canis Major. The star is 3 billion km away from earth. If it were to be placed at the center of our solar system, its outer shell would reach beyond the orbit of Saturn and very near to Jupiter's orbit. It is a very unstable star, and is predicted to explode as a hypernova, wiping out any life within a couple of light years away. This could happen any time in the next 100,000 years, and thankfully there are no hypergiants close enough to have this catastrophic effect on Earth.
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