The popular buzzword afterimage space has been very popular recently, "Inside the light cone is destiny". Light cone refers to the light scattered from a world forming a three-dimensional cone in four-dimensional space-time.
Why is it said: Destiny is inside the light cone?
First, suppose you light a candle and the light will spread around in the form of an expanding bubble, and according to the theory of relativity, no mass object can exceed the speed of light, so you will never escape this bubble. If we imagine the current state as a slice of two-dimensional space. At this time, the bubbles are like a growing circle. Stacking these circles will form a cone, which is the light cone.
As the most important structure in Einstein's theory of relativity, the light cone affects the most fundamental causal relationship in the universe. Suppose that an supernova explosion occurs in the depths of the universe far away from the earth, and the explosion of light cone will not have any impact on us before it reaches the earth, and we cannot understand any information about the explosion.
Only when the light cone reaches the earth can we see this explosion event. This is the [law of cause and effect] of classical physics.
In the space, we can move in any direction without any constraints. And in time, continuous light cones will force us to only move from the past to the future and never look back. In relativity, time is the direction of the light cone, and space is perpendicular to time. In the cosmic region without gravity, their structures are straight. Time and space will form a symmetrical linear grid, and all directions of ray tracing will be consistent. If around the earth, when an apple falls downwards under the gravity of the earth, its gravity not only affects the object itself, but also affects the direction of the light cone of the object. Therefore, around a massive planet, the direction of the light cone will be curved, that is, time will also bend toward the center of the planet. The reason why the apple falls is because its future points to the earth. Mass distorts the geometry of space-time and space, making time and space relative. This is general theory of relativity of . When an object has a larger mass, the more time and space it is bent. If it is an object with infinite gravity, the bending of time and space will also become infinite. All light cones will be completely facing down.
If we light a candle here, all light cones will fall into the center of the object, which is what we call a black hole. As the quasar with the greatest gravity in the universe, the empty verbal rule pushes all objects to the center. If we imagine a black hole as a two-dimensional slice and form a cylinder in space and time, its boundary is the event world, and some light outside the horizon can escape, while all light within the horizon cannot escape. In a black hole, the light cone causes the path of any object to go down, and time itself points to the center of the black hole.
When a massive star explodes and converges, it emits the last light, and at the same time it emits the last bubble that continues to expand. But in the space-time curved by stars, from the outside, the bubble seems to have become still, so a black hole is formed. It can also be said that it is a light cone fixed by the green space-time zone. If the distorted space-time is straightened and the direction of time flows from left to right, we can clearly see that the black hole's horizon forms a light cone. So after passing through the horizon, you can only fall like the center of a black hole, because that is the future of the world. If we compress the image, we will see that the outside and inside of the black hole form two different regions. Once we cross the horizon, outside the horizon becomes our past, and the lead to the starting point is also the ultimate fate of any object after passing through the world horizon.
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