Blue dwarf
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Blue Giants are main sequence stars of spectral type O.
A typical type O giant has a mass of 50 Suns and is tens of thousands of times more luminous than the Sun. Hottest of all the main sequence stars yet known are of type O3. Because very massive stars have short lifespans, blue giants are extremely rare: only about one star in ten million is a blue giant. However, because they are so luminous (and thus more easily seen), a disproportionate number of O stars have been charted in comparison to other star classes.
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