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This page focuses on Sun-like stars near the Solar System, which are especially important in astronomy because they resemble the environment in which life developed on Earth. G-type stars are stable over billions of years and can host planetary systems with a wide range of planets. Studying nearby Sun-like stars helps scientists compare other systems to our own and assess where conditions similar to those around the Sun may exist elsewhere in the galaxy.
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Stars | Exoplanets | Sun-like star
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Research in Sun-like stars
StellarGuide: Stars
Stars are enormous spheres of hot gas that shine by generating energy through nuclear fusion in their cores. Most stars are made primarily of hydrogen and helium. In the center of a star, intense pressure and temperature cause hydrogen atoms to fuse into helium, releasing a tremendous amount of energy as light and heat.More about Stars
| Category | Spectral class | Typical mass (% of solar mass) | Typical size (% of solar radius) | Typical temperature (K) |
|---|---|---|---|---|
| , , | 10-200% | 50-300% | 2000-10000 K | |
| L, T, Y | 1.2-8.0% | 9-11% | 600-2500 K | |
| M | 7.5-50% | 10-60% | 2400-3900 K | |
| K | 50-80% | 60-90% | 3900-5200 K | |
| G | 80-120% | 80-120% | 5200-6000 K | |
| A, F, B, O | 200-3000% | 200-5000% | 7000-40000 K | |
| K|G|F|A|B | 80-150% | 120-300% | 4500-6000 K | |
| A|B|O, G|F|A, M|G|F|A, K|M|S | 50-300% | 500-20000% | 3000-5000 K | |
| K|M|C, G|F, B|O | 500-10000% | 10000-100000% | 3000-35000 K | |
| A|B, G|F, K|M | 2000-20000% | 50000-200000% | 3000-40000 K | |
| WC|WN|WO | 1000-10000% | 50-500% | 30000-200000 K | |
| DA|DC|DQ|DZ | 20-140% | 0.7-1.5% | 5000-150000 K | |
| 100-300% | 0.001-0.002% | 600000-1000000 K | ||
| , , | 300-10000000% | 0.000001-1% | 0-10000000 K |
