An elementary school student told me, “Someday, I will invent a light bending machine, so I can bend the light around me and make me invisible.”
[read the short summary of conception]
Light is a package of energy. Space-time also came from energy. There will be a conservation of energy between the light and the space. When the sun light enters the gravity field of earth, the sun light should be accelerated. But it never happened because the light has already reached the limit of speed. To balance with the acceleration of gravity, the light is deteriorated or diffracted. When the sun light enters the weak gravity field of earth, the low level energy of light is diffracted (figure 1). The lower level of this sun light is the red light. As the light goes to the center of earth, there will be more diffraction. Finally, only the blue light that directly reach the earth surface. This blue light makes the sky looks blue.
Figure 1, 2, 3, and 4
The colorful light is mixed on earth surface that make the sun light become white (figure 2). In the polar region, the compression of space-time is lower than the equator area. The light that escapes from gravity of earth leaves colorful light (figure 3). We named it as aurora. As the space-time compression is very high in the equator area, only red and yellow light are leaved by the escape light (figure 4). These light coloring the sunset and sunrise.
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