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Small main sequence stars may continue undergoing hydrogen fusion for hundreds of billions of years. These stars are called _____. A) protostars. B) red dwarfs. C) white dwarfs. D) neutron stars. E) black holes

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Small main sequence stars may continue undergoing hydrogen fusion for hundreds of billions of years. These stars are called red dwarfs. The correct option among all the options that are given in the question is the second option or option "B". I hope that this has helped you.

Answer:

Correct option is B i.e is Red Dwarfs

Explanation:

Stellar evolution is the mechanism through which a star changes over time.  Tiny, relatively cold, minimal-mass red dwarfs gradually fusion hydrogen and stay on main sequence for trillions of years or longer.

Stellar models signify that red dwarfs fewer than 0.35 M are completely convective. As a result, the helium released by thermonuclear fusion of hydrogen is continually remixed across the star, eliminating the develop-up of helium at a core, extending  fusion period.

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