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Type O
These stars are the hottest and brightest stars in the sky. Their color is a bright blue that is roughly one-million times brighter than our sun. Most of the light that is emitted by this type of star is in the ultra-violet end of the spectrum. These stars are around 60 times the size of our sun. O-type stars have a surface temperature of over 25,000 kelvin, which is what gives the star its blue color.
Type B
B-class stars also shine blue, although not as brightly as O-type stars. They range in surface temperature from 11,000 to 25,000 degrees Kelvin and are on average 18 times the size of our sun. B-type stars are only 20,000 time brighter than our sun. O and B type stars do not last very long because they burn their fuel at an enormous rate. Many of these stars are clustered together with O-type stars.
Type A
These stars are the most common stars that you see in the sky. They have a white-blue color to the naked eye. Still powerful compared to our sun, they are around 80 times brighter than our sun. A-type stars are 2.5 times the size of our sun with a surface temperature of 7,500 to 11,000 Kelvin. A-type stars are the brightest stars seen in the night sky with the naked eye.
Type F
F-type stars are average-sized stars, which are slightly larger than our sun. Their color is white with a slight tinge of yellow to it. Ringing in at roughly 1.3 times the size of our sun, they are only 6 times brighter. The surface temperature of these stars is 6,000 to 7,000 Kelvin, which is not much hotter than our own. These are the largest of the dwarf, or young, stars of the galaxy.
Type G
To find a G-type star, you need look no further than our sun. It burns white-yellow like all G-type stars with a surface temperature between 5,000 and 6,000 Kelvin. Like all dwarf stars, they are young stars that burn for approximately 10-billion years. G-type stars hold interest because it is believed this is the best type of star to give life.
Type K
Type-K stars look orange in the sky. They vary in size, with some being super giants because most of their fuel is used up and gravity around the star has gone weak allowing it to swell. Their surface temperature is between 3,500 and 5,000 Kelvin. These stars are only one-quarter as bright as our sun, even though they are just slightly smaller. There are not many of these stars that can be seen with the naked eye, but they are there.
Type M
These are very common stars in the sky, there are more M-type stars than any other. They are classed as red dwarf stars usually. However there are some super giants that fit into this category. This type of star is the oldest star and has burned almost all of its fuel. Having the least amount of energy of all the stars, its light is faint and red. The mass or weight of these stars is one-quarter of our sun's mass.