Meaning of SUN in English


solar system revolve.

It is about five billion years old and is the dominant body of the system, with more than 99% of its mass. It converts five million tons of matter into energy every second by nuclear fusion reactions in its core, producing neutrinos (see solar neutrino problem ) and solar radiation. The small amount of this energy that penetrates Earth's atmosphere provides the light and heat that support life. A sphere of luminous gas 864,950 mi (1,392,000 km) in diameter, the Sun has about 330,000 times the mass of Earth. Its core temperature is close to 27 million kF (15 million kC) and its surface temperature about 10,000 kF (6,000 kC). The Sun, a spectral type G (yellow) star, has fairly average properties for a main-sequence star (see Hertzsprung-Russell diagram ). It rotates at different rates at different latitudes; one rotation takes 36 days at the poles but only 25 days at the equator. The visible surface, or photosphere , is in constant motion, with the number and position of sunspot s changing in a regular solar cycle . External phenomena include magnetic activity extending into the chromosphere and corona , solar flare s, solar prominence s, and the solar wind . Effects on Earth include aurora s and disruption of radio communications and power-transmission lines. Despite its activity, the Sun appears to have remained relatively unchanged for billions of years. See also eclipse ; heliopause .


[c mediumvioletred] (as used in expressions)

Sun tzu

Baltimore Sun

the Sun King

Moon Sun Myung

sun bear

sun dance

sun worship

{{link=Sun Yat sen">Sun Yat sen

Sun Yixian

Yi Sun shin

Britannica English dictionary.      Английский словарь Британика.