A Class G star is the third-dimmest type of main sequence star beside brown dwarfs. They are typically colored yellow or yellow-white. They made up roughly 8% of all main-sequence stars.
A typical Class G star has a mass of 0.9 (0.8 to 1.04) solar masses, a radius of 1.05 (0.96 to 1.15) solar radii, a luminosity of 1 (0.6 to 1.5) solar luminosity, a surface temperature of 5,600 K (5,200 K to 6,000 K), and a lifespan of 10,000,000,000 years on average. Their habitable zones range from ~0.6 to 1 AU, and their long lifespans and relatively high brightness mean they are very good candidates for life-bearing planets. Earth's sun is a class G star, actually, as are many stars with known extrasolar planets.
| 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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