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. The core of Class G stars are usually at the range of 15,000,000°K (25,000,000°F).
Their habitable zones range from ~0.7 to 1.1 AU, and their long lifespans and relatively high brightness mean they are good candidates for life-bearing planets. Earth's sun is a class G star, actually, as are many stars with known extrasolar planets.
In the search for extraterrestial life, these stars, especially the less bright G stars (<G5V) have planets that are possible candidates for alien life. While they are good candidates, these stars are overlooked by K-class stars.
- 0B yrs: Random protostar's gas forms a moderate-sized yellow star.
- 1B yrs: A newborn yellow dwarf star finally formed.
- 1.5B years: Star's planets, if any, finalized.
- 2B years: Star's system established.
- 5B years: Peak of well-being of star
- 6.5B years: Star is increasingly luminous.
- 9.5B years: Star Becomes an orange subgiant.
- 10B years: Star becomes a red giant.
- 10.5B years: Star explodes into a planetary nebula and leaves behind a white dwarf
- 11B years: Planetary nebula evaporates.
- 12B years: The white dwarf's peak in luminosity, before a slow cooldown.
- 15B years: White dwarf is considerably cooler, although it still has extremities.
|Spectral type||Mass||Radius||Luminosity||Temperature (Fahrenheit)|
|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 · ℃ · ⩡|