The smallest stars in the universe are Red Dwarfs. In fact, the smallest stars in the universe have just 7.5% the mass of the Sun. But Red Dwarfs are the longestlived stars with lifespans stretching from 1 trillion to 12 trillion years. That means the oldest red dwarf star in the universe is just getting started, and the first red dwarf to ever form in the universe will still be around for trillions of years to come. But today's red dwarfs are violent stars, though they will slowly age and cool to become white dwarfs and then ultimately black dwarfs. When the last red dwarf dies, there will be no more stars shining in the universe.

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References:
Adams, Bodenheimer, & Laughlin (2005): https://onlinelibrary.wiley.com/doi/a...

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