A classification of galaxies are small in size, but are classified according to the form ahligi or helical or gay, and d character is used to indicate this type
It is small in size classification of galaxies, but they may be classified according to the form taken by a spiral or elliptical, or eccentric, and uses symbols d to refer to this type
A small category of galaxies, but they may be classified according to the form they take elliptical or spiral or irregular, this type is used to refer to the letter D