We don't need to go into a black hole, we just need to get to the edge of the black hole and we can cross it... For example, if a spacecraft can successfully reach the edge of a black hole and return to Earth! The time to return to Earth! It could be decades or even hundreds of years in the future, it could be decades ago or even hundreds of years ago! So where?

It's the singularity of the black hole, this singularity can only be measured with a professional instrument, anyway, Xiao Yu doesn't know what the instrument is, Hawking said that the gravity in this black hole is higher than that of the earth, quoting Einstein's general theory of relativity, time is equal to gravity, and the heavier the gravity, the slower time passes. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 Of course, we have another way to travel through time.

Everyone remembers that Superman rotates counterclockwise at a superfast speed outside the Earth, turning back the Earth's time back to a day ago, and we can assume that time equals gravity, the speed of light equals time, and time equals the speed of light. At the speed of light, time is infinitely close to zero. Faster-than-light time is negative, and isn't there another way to go back in time?

At the same time, the spatial dimension of human life is three-dimensional space, that is, three-dimensional, there are different creatures in different dimensions, and they are more perfect than us in time, space and speed.

Good Xiao Yu took the opportunity of Kavin to tell you that you can do an experiment about wormholes, draw two points on a piece of paper, the two points are not the shortest straight line, you align the two points and fold them in half, and use a pen to pass through them, so these two points coincide, yes, this is the wormhole, this is the phenomenon of folding the universe in half, and this channel is the wormhole.

Some friends want to ask, since there is a black hole, why don't you see a white hole? The white hole is still a kind of assumption at present, and some people observe that the black hole absorbs and says that the gravity of matter is very high, and even the ethereal light will be sucked into it, so will there be a special exit? Then the white hole theory appeared. A white hole is a spit out of what a black hole absorbs and turns into matter.

Okay, that's all for this episode, we'll see you next time