Dwarf in Red Dwarf is a name given to a class of stars that are less massive and smaller in size than the Sun. There are two types of dwarf stars: red dwarfs and white dwarfs. The most common type of star in the Milky Way is also a red dwarf—a small, cool star that can be as small as half the mass of our Sun or smaller. Ours is about half the mass of the Sun. In 2005, researchers using data from the Two Micron All-Sky Survey (2MASS) found that almost all main-sequence stars below 0.5 solar masses are low-mass dwarfs. More recently, other studies have confirmed this result. Thus, dwarf stars account for nearly all low-mass stars in the galaxy. Stars more massive than our Sun are called standard stars. They make up about 8 percent of the total number of stars in the Milky Way. Our Galaxy has between 100 billion and 400 billion stars, so this means that there are between 2 and 8 times as many standard stars as dwarf stars. The majority of stars are expected to be either dwarf stars or standard stars.