1. Special relativity
It has only one sentence: no matter how the observer moves, the speed of light observed remains unchanged. Some very wonderful conclusions can be drawn from this seemingly simple sentence, which are seriously contrary to our daily experience, but they have now proved to be correct.
For example, suppose a beam of light moves north at 300,000 kilometers per second and a spacecraft is 150,000 kilometers away from that beam of light and the speed of light is 300,000 kilometers per second. For 150,000 kilometers divided by time = 300,000 kilometers divided by one second, then: time is equal to 0.5 seconds. That is to say, people on earth have passed a second, and people who move at 150,000 kilometers per hour will feel that only half a second has passed.
Conclusion: Speed can change time. The faster you move, the slower your time will pass. When you move at the speed of light, time will be stationary.
For example, Bolt participated in the 100-meter race at 10 meters per second, and after the next person cheering for him for the past second, Bolt only felt that 29990 seconds, or 0.99996667 seconds, had passed by 300,000 minutes. After the 100-meter race, Bolt was 0.0003333 seconds younger than us.
2. General relativity.
Mass can change time and space, bending time and space; and the greater the mass, the more severe the time and space are pulled. Just like the faster the time, the slower the passage of time. For example, the sun bends time and space, which is like putting a shot put in the bed and pressing the sponge cushion out of a pit.
Einstein came to the bold conclusion that gravity is not a force, but in fact it doesn't exist at all. The phenomenon that we usually see the motion of the earth and planets around the sun is not that the sun is attracting them to rotate, but that the sun is bending time and space, and the earth and planets have to rotate along the curved space-time.
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