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The Sun
The Sun is the center of our Solar system and is the main source of all light on Earth.

The Sun, a 4.5 billion-year-old yellow dwarf star, is the center of our Solar system and is the main source of light on Earth.

The Sun has an absolute magnitude of +4.83, estimated to be brighter than about 85% of the stars in the Milky Way, most of which are red dwarfs.

The Sun is a G-type main-sequence star that comprises about 99.86% of the mass of the Solar System. Its mass is estimated at 2 octillion tons, while it's losing 5 million tons of material each second in form of radiation and ionized corona flares that cool down in space and propagate as solar wind.

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The Sun is by far the brightest object in the Earth's sky, with an apparent magnitude of −26.74. This is about 13 billion times brighter than the next brightest star, Sirius, which has an apparent magnitude of −1.46.

wind

The Sun is about 149.6 million kilometers away from Earth. Light travels at a speed of about 299,792 kilometers per second. So, it takes about 8 minutes and 20 seconds for light to travel from the Sun to Earth.

Thermonuclear reactions at temperatures about 14 million Kelvin in its core produce high energy gamma-rays that are absorbed and converted into lower energy radiation by ionized atoms in its relatively thin and much cooler (4000 - 6000 K) photosphere and chromosphere layers.

UV radiation of the Sun

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