The twinkling stars in the night sky catch our eye. But have you ever wondered how these stars are made? Or why do the stars twinkle? In today’s special event I will talk about the life of stars. So let’s find out the secret of the life of stars.
What is star?
Stars are heavenly bodies that shine like a sun, many shine brightly but others have a dim glow. Some a red while some are blue.
Stars are giant balls of gas made of hydrogen bound together by their own force of gravity.
The energy that makes them shine comes from a kind of power plant in their interior where atomic nuclei of the hydrogen atoms are fused together to form helium atoms.
The stars do not live forever and die at some point. Their remains become either a neutral star or a black hole.
How stars are born?
The cradle of the star is a cloud of hydrogen and dust there are numerous search clouds in the universe.
By the action of external force, the cloud gets compress and keeps pushing itself together due to increased force of attraction among the particles.
After hundreds of thousands of years, it begins to shine. A proto-star at an early stage is formed. This keeps pulling itself together while rotating and become hotter and hotter till its interior reaches a temperature of around 10 million degrees Celsius.
In the core, the fusion of hydrogen into helium releases an enormous amount of energy. The star becomes a main-sequence star. It shines approximately for 10 billion years.
Do all stars shine with same intensity?
There are two reasons why all stars in the night sky do not shine equally bright.
Firstly, the stars are a different distance from the earth.
Secondly, their luminosity depends on their age.
Young stars are bright hot and shine blush white and older stars which have already given out a lot of energy are red in color and are cooler. Aasan is middle-aged with a temperature of around 5500 degrees Celsius on its surface and a yellow shine.
Stars are like a window to the past. If a star is 10 light-years away, its light takes 10 years to reach us.
Stars and black hole
A black hole is a compressed dent mass with an intense gravitational field. The gravitational force of the black hole is so strong that nothing in its surroundings can escape from it, not even light.
The space around a black hole gets distorted. It is similar to the Bing datak funnel which becomes latter and flatters towards the upper margin. Everything wears this funnel then slips down and makes due to its own weight.
How stars die?
When the fusion of hydrogen into helium takes place in the core of the star, it continues to shine for 10 billion years.
At some point in time, the hydrogen gets consumed. Helium then melts to form carbon. Whatever happen after this depends on the mass of the star.
Lighter stars like the sun expand to become red faint till the fusion stops and then implode to become a white mass about the size of the Earth. The stars which are larger in size, about 20 times heavier than our sun expand to become faint and finally exploded. This is known as a supernova. This either becomes a neutron star or black hole.