Finally, red dwarf stars are small, young, and very long lasting main sequence (hydrogen-fusing) stars that will last for 100s of trillions of years, long after every other type of star has died, while a red giant star is a dying star that is fusing helium or heavier elements in its core and last between 10s of thousands and 100s of millions of years. read more
red dwarf :a small, old, relatively cool star; approximately 100 times the mass of Jupiter. red giant:a large, old, luminous star; has a relatively low surface temperature and a diameter large relative to the sun. read more