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Star🕳️🕳️
A typical star consists of hydrogen gas. Huge gravitational forces squeezythe atoms together to form helium along with the release of tremendous amount of energy.
The energy is radiated into space as heat and light. Stars can be classified by their size, mass, brightness, colour, temperature and age.
There are yellow stars,red giants,blue giants ,super giants,and white dwarfs. Our sun is a yellow star of medium size and is often called a dwarf star . It's surface temperature is 6,000 C but at its center it is 15million degrees centigrade.it is shining for the last 5 billion years and is expected to shine still for another 5 billion years before it dies . After the sun the nearest star is proxima Centauri located more than four light years away.
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Life Cycle of a Star
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Stars also undergo a life cycle
During the first stage , the gravity pulls the clouds of gas and dust resulting in a hot spinning ball.it is known as a proster not giving light .. In a process that take million years,its further shrinking cause huge build up of pressure and heat .At a temperature around 10 million degrees centigrade,the hydrogen start starts changing into helium
releasing enormous heat and light and a Star is born .
During it's second stage extending billion years , the shining star usually uses up it's hydrogen fuel slowly. IN the third stage when it's fuel is depleted, star expands and cools to form a red giants or super giants giving more red lights for another million year. In the fourth stage ,red giant will cool and gravity will squeeze further to form a white dwarf slowly fades away over million years to form black dwarf .it will emit light.its material return to space.
