But it would be an empty universe indeed if it were not for the people I love, and who love me. Without them, the wonder of it all would be lost on me. 这是原文，多年前记得他说的这一句，再次听到，感谢小涵哥的最后一句。
Time When you falls to a black hole, two things will happen. Using tense is a bit strange, but bear with me. Due to immense gravity, anything thing that passes the event horizon will experience a slower time. Slow down to the extend that time stops from the perspective of an outsider. Time stops in the event horizon. If you count time as one dimension, the block hole compress one dimension at this ‘time’. Also being compressed is the material that being thrown in to the event horizon. According to Stephen Hawkings the information of the material will be recorded in the surface of the event horizon ‘forever’, because there is no time anymore. The face, colour, shape and markings of the material will be recorded on a 2-D surface of the event horizon, being a ‘sphere’ as observed from an outsider. From a 3-D object not it’s only a 2-D information, one dimension is compressed. The process of the 3-D object being compressed to a 2-D information from the event horizon share a set of characteristics with something we concern. The event horizon is a line of no return. Once you pass through it, there is no way you can go back outside. It’s a One-way journey. Second, it’s a 2-Dimensional ‘sphere’ meaning the object now can actually move around like a 2-D creature on a sphere. Maybe this is the only reasonable metaphor of have an ant walking on a piece of paper, then you suddenly curl up that paper to creat a worm-hole. That creature used to be a 3-D creature with time and ‘depth’. But now, it’s only width and length and no time. Don’t laugh, that’s us. Loosing one dimension makes no sense to this 2-D creature. He/she knows if they can more from left to right, there is no physics to stop them from moving from up to down too. But from their experience, they can only move left and right. Moving up and down is only an imagination. They can only move towards the center (or singularity) of the black hole eternally. That’s what we experience now. We know there may be no physics that prevent us from traveling backwards in time. But we just can not. We can only progress in ‘time’ at a very constant rate, unless you move yourself very close to a massive object, or travelling close to the speed of light. Both have the same effect of creating or approaching infinite mass/ density. But like moving to the black hole event horizon, which is perfectly avoidable, time is not necessarily one-direction. We must be on the verge of, or already inside some kind of event horizon ‘now’. The Universe we are living now must be effected by some kind of cosmic force similar to a black hole to an object in space. Time, the passage and existance Imagine your landlord says you can use your apartment for a rent and no more than that. It does not mean there is no room next to you, or you can not physically walk to another room next door. And you know it. We are moving from past to present, then future. This is the passage of time in one direction. We can not stay in the ‘present’ forever and shall move to what we call the future today. This is the same as we need to move from room to room with no turning back. We know the room behind us still exists and function, and rooms ahead of us are waiting for us to arrive. The only rule is to move to another room at a speed call time. The new room is not called time, but a different dimension. In our world, we can move up down, left right, and front and back in space. When we are falling into a black hole, we will have no choice of front and back because of the immense gravitational pull of the black hole. The sure passage from back to front means there is no turning back, but it does not mean the back no longer exist. The same applies to the past and present. Time is a flow that forces our universe to move to the present from the past. Time is defined as the actual flow of dimension in one direction. The speed of flow is not time. The speed of flow is defined by the gravitational force of the dimension ahead that pulls this universe. That’s exactly what should be happening in the black hole on the horizon.
