Dehradun, , India
Management Skills, Business Analyst, Finance
0 टिप्पणी करें | 9 लोगो ने देखा है | 09 सितम्बर 18  | Sahil Jadia
Black Holes - Prerequisite
A black hole is anything but empty space. It is a great amount of matter packed into a very small area just like a giant earth’s mass is packed into a small golf ball. This so dense region as a result of star’s dying which consequently results out in a very strong gravitational field that nothing, not even light, can escape. ‘Not even light’ predicts about the empty region of infinite strength inwards and so black holes are invisible.

The idea about the region of infinite gravitational strength that not even light could escape had been around for many years. In 1967, Physicist John Wheeler coined the term ‘Black Holes’. However, the existence of black holes was first 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 that the force of gravity overwhelms all other forces and produces a black hole.

How Scientists come to know about the position of black holes?
Scientists cannot directly observe black holes (since they are invisible) with telescopes that detect X-Rays, light, or other forms of EM radiation. We can, however, predict the presence of black holes and study them by detecting their effect on other matter nearby. For example, if a black hole passes through a cloud of interstellar matter, it will draw matter inward in a process known as Accretion. The same 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.
For instance, the attracted issue accelerates also heats up, it emits x-rays with the intention of exuding interested in space. Recent discoveries hold the evidence that black holes have a dramatic influence on the neighbourhoods around them like emitting powerful Gamma-Ray Bursts.

One Star's End is a Black Hole’s Beginning.
Most black holes form from the remnants of a large star that dies in a Supernova Explosion. Smaller stars become dense Neutron Stars, which are not massive enough to trap light. 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, the strange thing occurs as the star

collapses. 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 (condition of frozen collapsing).

Will our Sun ever be turn up into a black hole?
The Sun does not have enough mass to collapse into a black hole. In billions of years, when the sun is at the end of its life, it will become a Red Giant Star. Then, when it has used the last of its fuel, it will throw off its outer layers and turn into a glowing ring of gas called a Planetary Nebula. Finally, all that will be left of the sun is a cooling White Dwarf Star.

Words to know…
1) Star’s Dying – After a billion years when the process of burning that keep star alive come to an end, the ability of star to hold its greater mass tends to lose.

2) Interstellar – Place near or in between the star.

3) Accretion – Forming of larger bodies under the influence of gravity.

4) Gamma Ray – Type of EM radiations originates from radioactive decay.

5) Supernova – Extra bright star.

6) Neutron Stars - A star of an extraordinarily tiny radius as well as fantastically far above the ground density, collected of meticulously packed neutrons."

7) Event Horizon – A point near the surface of a black hole or a point of no return.

8) Red Giant Star – Star of lower temperature but greater radius than the sun.

9) Nebula – Cloud of dust.

10) White Dwarf Star – The remaining of star’s mass after completing all the stages of burning.

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