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A Class O star is the brightest type of star, sitting on the line between main sequence and giant. Traditionally, they are colored blue. They are also the rarest type of main-sequence star, making up only 0.00001% of luminous stars.

A typical class O star has a mass of 50 solar masses, a radius of 10 solar radii, a luminosity of 100,000 solar luminosities, a surface temperature of 40000 K and a lifespan of 1,000,000 years.

The habitable zone of a typical O-Class star is on the order of 300 AU. This, coupled with their short lifespans, makes them poor candidates for having solar systems, especially those that support life.

Stellar Classes
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