The star around which the Earth revolves, and the planet's source of light and heat, hence life. The Sun is a globe of gas, 1.4 × 106 km (8.65 × 105 mi) in diameter with a mass 333,000 times the Earth, held together by its own gravity. The surface temperature of the Sun is about 6000 K (10,000°F); since solids and liquids do not exist at these temperatures, the Sun is entirely gaseous. Almost all the gas is in atomic form, although a few molecules exist in the coolest surface regions, such as sunspots.
The Sun is a typical member of the spectral class dG2, stars of surface temperature 6000 K. The d stands for a dwarf, a normal star of that class. See also Spectral type.
The star around which the Earth revolves, and the planet's source of light and heat, hence life. The Sun is a globe of gas, 1.4 × 106 km (8.65 × 105 mi) in diameter with a mass 333,000 times the Earth, held together by its own gravity. The surface temperature of the Sun is about 6000 K (10,000°F); since solids and liquids do not exist at these temperatures, the Sun is entirely gaseous. Almost all the gas is in atomic form, although a few molecules exist in the coolest surface regions, such as sunspots.
The Sun is a typical member of the spectral class dG2, stars of surface temperature 6000 K. The d stands for a dwarf, a normal star of that class. See also Spectral type.
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