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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
Φ · Ψ · Ω · Q · DE · GR · σ ς · Θ · N · D · BS · Y · T · L · M · C · S · QS · K · G · F · A · B · LBV · β · O · W · N · X · n0 · Exotic (Π · Σ · Γ · Δ · μ) · δ · I · TŻO · BL · ·

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