Why does the spaceship slow down when it approaches the speed of light? No, spaceship exists in physics and time exists in logic. Why does time change when a physical object moves close to the speed of light?

First of all, time is also a physical existence, not a purely logical existence. For example, speed is a certain physical quantity, which is derived from the derivative of distance to time. If time is only a logical existence, isn't speed also a logical existence? If you want to understand time in physics from the perspective of comparative essence

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1. How long does it take for a man to be on a spaceship at the speed of light?
2. The spaceship flies at the speed of 200000 km. People send a beam of light on the spaceship. The light travels at the speed of light C in the spaceship. What is the speed of light measured by people on earth
3. If you sail in a spaceship with a speed close to the speed of light per hour, your life will be much longer than that of people on earth? If you sail in a spaceship whose speed is close to the speed of light per hour, your life will be much longer than that of people on earth. There is a potential field where the energy of matter will change with the change of speed. Therefore, the change and comparison of time is based on the speed of matter. This is why time is one of the elements of four-dimensional space?
4. After reading a popular science book, I have a problem that I don't quite understand. It's basically like this: if I start from the earth and fly in a spaceship at a speed close to the speed of light (the unit of light speed is c), (for example, to fly to Pluto, you need to stay in a spacecraft for more than ten years to get there), and you think it has been more than ten years since you started, but at this time, people on earth have been more than twenty years or thirty years. Why? (I don't know if it's wrong, but I can't understand these time problems.)
5. Light on a spaceship traveling at the speed of light If a forward beam of light and a backward beam of light are emitted from a spaceship flying at the speed of light, what are their respective speeds? If the forward beam of light flies at the speed of light, then it is the same as the speed of the spaceship. In this way, people behind the spaceship can not see what they are doing in front of them?
6. How long does it take for an airplane (airliner) to arrive from the earth to the moon?
7. Do objects have the same mass on earth, moon and spaceship
8. How long does it take to get to the moon by the fastest spaceship now RT
9. How long does it take to get from the moon to the earth at the speed of light
10. The speed of light is about 3 × 10 5 power kilometers per second. It takes 12 years for the light emitted by a star to reach the earth. If the speed of light is 3.1 × 10 7 power seconds per year, how many kilometers is the star from the earth?
11. There is a fraction, the denominator plus 2 equals 2 / 5, and the denominator minus 3 equals 1 / 2. What is the sum of the numerator and denominator of this fraction? How to find the specific answer process
12. How to say a knife and fork
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14. In English, for example, adjectives modify nouns, what words modify what words, what must be followed by, who can teach me these knowledge points? These belong to grammar problems, or need daily learning accumulation?
15. In △ ABC, ab = 13, AC = 15, high ad = 12, then the length of BC is () A. 14b. 14 or 4C. 8D. 4 or 8
16. English translation 1. We have been waiting for him all morning 2. How long has it rained? 3. How long has she been teaching English? 4. She has been writing this book since last week 5. He hasn't been working here all these years 6. What newspaper are you reading recently? 7. The old man worked in the park for two hours
17. Given that ABC is not equal to 0, the square of AX + BX + C = 0, the square of BX + CX + a = 0, the square of Cx + ax + B = 0, find its common root
18. Given the position of the number A.B.C on the number axis Moreover, the distance from B. C to the origin is equal, and | A-B | - | - a | - | B + C is simplified| Picture | - | - - | - | - | - | - | - → a b 0 c
19. It is known that the function f (x) is an odd function over [- 1,1] and monotonically decreases over the interval [- 1,0] If f (2m-3) + F (1-m) > 0, find the value range of real number M
20. What is the sum of a number added, subtracted, and divided equal to 8.6?