What are dwarf stars?
Dwarf stars are small stars.
There are two type of dwarf stars. One is a red dwarf, which are mostly just a bit bigger than Jupiter, and live for a trillion (or more) years. The stars of this kind emit red light. The other type is a white dwarf, which is the core of a star with a mass of nearby the Sun's mass. It is about the size of Earth. Even our Sun will become a white dwarf, emitting weak white light but will also last for trillions of years.
Dwarf Stars emit weak light and cannot be visible to our naked eyes.