STAR LIFE TO SUPERNOVA

BY RAJ PREMANI

LIFE OF STAR There are millions of star in our galaxy but now the

question arises HOW DOES THE STARS ARE FORMED ??????????? OR WHERE DOES IT COME FROM????

Basically these stars are formed in the clouds of dust and gas ….

The massive clouds in the universe experiences their own gravitational forces and begin to collapse so it fall on itself (DENSED AT THE CENTER)…..

Now as we move to the center of the cloud it become

denser and denser and hot too due to gravitational forces. Now because of the gravitational force the dust and the

gas particles are brought so close at the center so that these particles begin to stick to each other.

Then result to form a star of hydrogen atom these hydrogen atom fuses to form helium and it creates the energy that powers every star.

The life of the star depends on the size of the star at its birth.

When the star is small there is a balance between the gravitational force and the pressure due to fusion of particles.

Time goes on and the star becomes supergiant and then the distance between the center and the edge of star goes on increasing that results into weaker gravitational force between them.

As the gravitational forces between the center and the edge become weak the star is unable to hold itself and the explosion of star take place that is termed as supernova..

This explosion posses very high energy such that it can light up our whole galaxy and we can also see it through earth surface through naked eyes.

SUPERNOVAA supernova is an explosion of a massive

supergiant star. It may shine with the brightness of 10 billion suns.

The total energy output may be 1044 joules, as much as the total output of the sun during its 10 billion year lifetime.

The likely scenario is that fusion proceeds to build up a core of iron.

We can say it’s the end of star life.

On average, a supernova will occur about once every 50 year in a galaxy the size of the Milky Way. Supernova leads to the formation of the black hole.

Black hole where the gravitational forces is so high that even light cannot escape out of it.

Black hole If a star has three times or more the core mass of the

Sun and collapses, it can form a black hole.Don't let the name fool you: a black hole is anything

but empty space. Rather, it is a great amount of matter packed into a

very small area - think of a star ten times more massive than the Sun squeezed into a sphere approximately the diameter of New York City.

The result is a gravitational field so strong that nothing, not even light, can escape.

Black holes were predicted by Einstein's theory of general relativity, which showed that when a massive star dies, it leaves behind a small, dense remnant core.

If the core's mass is more than about three times the mass of the Sun, the equations showed, the force of gravity overwhelms all other forces and produces a black hole.

Most black holes form from the remnants of a large star that dies in a supernova explosion.

Scientists can't directly observe black holes with telescopes that detect x-rays, light, or other forms of electromagnetic radiation

We can, however, infer the presence of black holes and study them by detecting their effect on other matter nearby.

If a black hole passes through a cloud of interstellar matter, for example, it will draw matter inward in a process known as accretion.

A similar process can occur if a normal star passes close to a black hole. In this case, the black hole can tear the star apart as it pulls it toward itself. As the attracted matter accelerates and heats up, it emits x-rays that radiate into space.

If the total mass of the star is large enough (about three times the mass of the Sun), it can be proven theoretically that no force can keep the star from collapsing under the influence of gravity.

However, as the star collapses, a strange thing occurs. As the surface of the star nears an imaginary surface called the "event horizon," time on the star slows relative to the time kept by observers far away. When the surface reaches the event horizon, time stands still, and the star can collapse no more - it is a frozen collapsing object.

Many scientists believe that there is other universe at the exit of wormhole

THANK YOU

RAJ PREMANI