Question

What is a red dwarf?​

Answer 1

A red dwarf is the smallest and coolest kind of star on the main sequence. Red dwarfs are by far the most common type of star in the Milky Way, at least in the neighborhood of the Sun, but because of their low luminosity, individual red dwarfs cannot be easily observed. 

Answer 2

It’s a dwarf planet which is not a planet it’s a neutron star which seems to be red .