, as it would look without the Earth's atmosphere. It is a typical example of a GV star
A GV star, or yellow dwarf, is a
main-sequence star. It is of
spectral type G and
luminosity class V on the
Hertzsprung-Russell Diagram. The term yellow dwarf is a
misnomer, because G-type stars actually range in color from white, for more luminous types like the
Sun, to only very slightly yellow for the less massive and luminous G-type main-sequence stars.
spectral classification for a chart of star color by light type.
GV stars are small (about 0.8 to 1.0
solar masses) and have a surface temperature of between 5,300 and 6,000
 Like other main-sequence stars, a GV star turns
helium in its core by means of
Sun is the most commonly known (and most easily seen) example of a GV star. Each second, it combines around 600 million
helium, changing about 4 million tons of
 Other GV stars include
Alpha Centauri A,
Tau Ceti, and
Our own Sun looks yellow through the
Earth's atmosphere due to
Rayleigh scattering. Without that, it would look white. Even though the name "dwarf" is used to compare yellow main sequence stars from giant stars, yellow dwarfs like the Sun are 90% brighter than all of the stars in the
Milky Way (which are largely orange dwarfs, red dwarfs, and white dwarfs).
A GV star fuses
hydrogen nuclei together and release energy for around 10 billion years. After the hydrogen is used up, the star will grow to many times its earlier size and become a red giant like
 Eventually the red giant will lose its outer layers of gas, which will become a
planetary nebula, while the inside of the star (also known as the
core) will cool and shrink into a small, very dense white dwarf.