Red dwarf

Red dwarfs are a type of low mass stars and temperatures well below that of the sun. These stars have masses and sizes between about 8% and 50% of those of the Sun. Although they dominate the population of the galaxy, no red dwarf is visible to the naked eye due to their low luminosities. The smaller and cooler red dwarfs, as TRAPPIST-1, belong to the category of "ultracool dwarfs", which include the lightest stars (<10% of the mass of the Sun) and brown dwarf