Answer:
The given blank can be filled with a small star.
Explanation:
M dwarf or a red dwarf refers to a cool and small star located on the main sequence, of M spectral type. The mass of red dwarf ranges from approximately 0.075 to about 0.50 solar mass and exhibits a surface temperature of less than 4000 Kelvin. At certain occasions, the K-type main-sequence stars, with the masses between the range 0.50 to 0.80 solar mass are also incorporated.