Yellow stars with surface temperatures of 5,200-6,000 Kelvin, including our Sun as the most familiar example. These stars have main sequence lifespans of 8-12 billion years and are considered prime candidates for supporting planetary systems with life.
The G-type classification comes from the Harvard system, with 'G' representing stars showing strong calcium H and K lines in their spectra. Our Sun is specifically classified as a G2V star, indicating it's in the middle of the G-type range and on the main sequence.
G-type stars are the cosmic Goldilocks of stellar types - not too hot, not too cool, but just right for supporting life as we know it! Our Sun is the perfect example, and astronomers are particularly interested in G-type stars when searching for exoplanets in habitable zones. These stars live long enough for complex life to evolve but aren't so cool that their habitable zones are tiny.
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