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Chapter 1.5 Even Light Cannot escape
Since we have already known that the speed of light can be dragged down by gravity, we can have a further step to research the black hole. When an object falls into a planet, the greater the gravity, the higher the speed of falling. If an object is pulled towards the Earth, it will strike the Earth with 11km per sec approximately. But this speed is still too small when compared with the speed of light.
But when we decrease the radius of our Earth to 1 hectare, the speed of falling will be as like as the speed of light.
If objects fall with speed of light into our Earth, they will be with the same acceleration. But when the radius of our Earth is reduced to less than 1 hectare, we will fall into this Earth with the same acceleration as the light does. Then, we may be able to see a beam of light in a stationary form.
In the 18 century, this idea had already proposed by some scientists. Then thought that there are some objects that will not allow light to escape from them. In the 20 century, Albert Einstein has proved that there is no matter travels faster than the light does, and he used the General of Relativity to show that gravity can both delay the time and twist our space.
On the surface of a black hole, light may travel in a stationary form; but light may still move towards the center of a black hole due to the great gravity. Since no matter travels faster than light does, all objects will be pulled into a black hole.
Time and space will be affected and twisted by the mass of a planet. Therefore, light will also be twisted and have their directions bent. When a beam of light passes on the surface of sun, the location which we look on Earth will be different when comparing with the real location.When a beam of light comes near a black hole, the light may be bent dramatically. And this makes that there are 2 images of the planet. This is called the Gravitational Lens Effect. We can deduce it from the General Relativity by Albert Einstein.
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1.0 Chapter Introduction
1.1 The Three Principles
1.2 The History of Black Hole
1.3 How Big is a Black Hole
1.4 Why Should we study Black Hole
1.5 Even light cannot escape?
1.6 The Bending of Light
1.7 Examples of Bending of Light
1.8 Gravitational Redshift
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