red dwarf       
noun [ C ] uk/ˌred ˈdwɔːf/ us/ˌred ˈdwɔːrf/
 红矮星
a type of small star 
  Red dwarfs are the most common type of star in the Milky Way. 红矮星是银河系中最常见的恒星类型。 
 The planet was found orbiting a red dwarf. 这颗行星被发现围绕着一颗红矮星运转。 
 - More examples
 - These tiny red dwarfs have 10 to 30 percent the mass of our Sun.
 - Gliese is a red dwarf, the most abundant type of star in our galaxy.
 - Other red dwarfs also might have planets.