A Class M star is the dimmest type of main sequence star besides brown dwarfs. They are typically colored red or red-orange. They are by far the most common type of luminous star, making up roughly 76% of all main sequence stars. A typical Class M star has a mass of 0.20 (0.08 to 0.45) solar masses, a radius of 0.3 (≤0.7) solar radii, a luminosity of 0.01 (≤0.08) solar luminosities, a surface temperature of 3,000 K (2,400 K to 3,700 K), and a lifespan of 1 to 10 trillion years.