What is the sun? Interesting facts about Sun?

Facts about the sun

Age : 4,600,000,000 years
Distance from the Earth :149.6 million km.
Diameter: 1.4 million km.
Surface Temparature : 5500*C
Temparature at the core : 14,000,000*C
Rotational period : 25 Earth days
Revolution period in the Milky way : 225 million years
Number of planets :8

The Sun is a star. It is a huge glowing ball of hydrogen and helium gas which is turned into helium gas through the nuclear process called ' fusion'. The energy thus released is being scattered in space as sunlight.

The sun looks much bigger and brighter to us than the other stars, because it is closer to the Earth, when compared with other stars. The sun is about 149.6 million kilometers away from the Earth, while the next closest star, Proxima Centauri, is about 2,50,000 times farther away.

The sun has a diameter of 1.4 million kilometer. It is about one million times bigger than our planet Earth. More than 1,000,000 globes with the size of the Earth, could fit inside the Sun.Almost all the light and heat of the Sun are emitted from its surface. So, the Sun's surface is also called the 'Photo sphere'. The average temperature of the photo sphere is about 5500C. 

All the planets in our solar system orbit the center of our galaxy- the Milky way. it takes about 225 million years, or one cosmic year, for the Sun, and the eight planets to orbit the Milky Way once. The gravitation of the Sun is far greater that that of the Earth. The Sun's force of gravity is 28 times stronger that the Earth's. The Sun emits many kinds of radiation, in addition to heat and light. Radio waves are one among them. Scientists learn a lot about the Sun by studying these waves with radio telescopes.

Scientists believe that after a hundred billion years, the Sun will shrink to become a white dwarf star, which will eventually fade into the cool, dark Universe.

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