Just like a slide in the universe where we live, a wide speed is relative, just like an absolute speed. If someone is still running fast, then using the positive negative throttle will definitely be big, so it is possible to return. The volume and time of the object are also related. The life span of ants is ten years, but they have completed what humans did in 100, and it is also/kloc for ants. Most of the space they see, just like the earth and other things we see outside the earth, has an absolute volume relationship between time and speed. If a person is 1000 meters long, then his life span is 1000 years. For example, a turtle has speed and life. This person in the universe is a traveler. The vast universe, like human neurons, is connected to the door of time and space.

Flying is not human's dream. Matter and matter are absolute, but stones are linked with calcium carbonate, ... and so on. You can say that all substances are linked, and they also contain substances smaller than quarks. If this substance can find antimatter, just like a magnet, then human will use it to fly into the sky. There is a hydrogen plate, which is a thin metal plate with a mass close to 0 or less and a density greater than titanium.

Light is also a kind of particle, which has a mass density. Human beings use solar energy to convert it into electric energy by using the thermal effect of light, so the energy of using light particles is infinite. In the more distant future, light particles will replace hydrogen.