Editing Dwarf star (section)

==History==
The term was originally coined in 1906 when the Danish astronomer [[Ejnar Hertzsprung]] noticed that the reddest stars – classified as K and M in the [[Stellar classification#Harvard spectral classification|Harvard scheme]] – could be divided into two distinct groups. They are either much brighter than the Sun, or much fainter. To distinguish these groups, he called them "[[giant star|giant]]" and "dwarf" stars,<ref name=Brown-Pais-Pippard-1995/> the dwarf stars being fainter and the giants being brighter than the Sun.

Most stars are currently classified under the ''Morgan Keenan System'' using the letters O, B, A, F, G, K, and M, a sequence from the hottest: ''[[O-type star|type&nbsp;O]]'', to the coolest: ''[[Red dwarf|type&nbsp;M]]''.

With the development of [[infrared astronomy]] in the late 20th&nbsp;century the Morgan Keenan system was extended to cooler types&nbsp;L and T, all of which are "dwarfs" but not all of which are  stars as such.