The solar mass is used to measurefixed starOr such as large galaxiescelestial bodiesThe mass unit of.Its size is equal tosunlightTotal mass of about 1.989 × 10thirtyKg (generally 2.0 × 10thirtyKg).The unit symbol can be expressed as M⊙: Sun mass isEarth mass330000 times.
The average density of the sun is 1.4 grams per cubic centimeter, but the density inside and outside the sun is different.Its shell is mostly gas, and its density is very small.But the more inside, the denser and denser the matter is.The density of the core may be 160 grams per cubic centimeter, which is nearly 20 times greater than the density of steel.Its total mass is 330000 times that of the earth[1]。
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Solar mass
sunlightEnergy is steadily emitted into the space all the time, only about 1/2.2 billion of which comes to the earth mainly in the form of radiation, becoming the main source of light and heat on the earth.The core of the sun keeps happeninghydrogenNuclear fusion becomesheliumNuclearThermonuclear reactionMore than 600 million tons of hydrogen nuclear fuel are burned every second, and about 4 million tons of hydrogen nuclear are actually consumed when fusion is turned into helium.This is how the great energy of the sun is generated.
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Since gravity provides the centripetal force required for revolution
。Obviously, when solving the equationplanetThe mass m is eliminated.Solve the solar mass
, can also be expressed as: M⊙
。
Today, astronomical units andUniversal gravitational constantThe value of has been accurately measured, however, the solar mass is rarely used to represent other planets in the solar system orConjoint starQuality;Only inMassive celestial bodyIs used on the measurement of (seeGauss gravitational constant)。Use interplanetaryradarVery accurate astronomical units (AU) and "G" have been measured, but the solar mass continues to be explored as an unsolved puzzle in the history of astronomy in customs.
IfearthThe solar mass can be calculated by converting the revolution period of 1 year and the distance between the sun and the earth of 150 million kilometers into international standard units.
The mass of the sun accounts for 99.8% of the total mass of the solar system.
The astronomical unit and the value of the gravitational constant have been accurately measured. However, the solar mass is not usually expressedsolar systemOther planets orConjoint starQuality;It is only used for the measurement of massive objects.Today, the use of interplanetary radar has measured very accurate astronomical units and "G"[2]。
