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?

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• 1. The speed of light is about 3 * 10 ^ 5 kilometers per second. It takes 10 years for the light emitted by a star to reach the earth. If the speed of light is 3.1 * 10 ^ 7 seconds per year, how many kilometers is the star from the earth?
• 2. The earth is a common and special star in the solar system______ ．
• 3. The earth is a common and special star in the solar system______ ．
• 4. The earth is a special planet in the solar system A. the sunlight is stable for a long time B stars revolve around the sun in the same direction The structure and motion characteristics of C earth are special D the earth is suitable for living and reproducing
• 5. As a special planet in the solar system, the earth mainly displays in the following aspects A is the most massive of the eight planets B has the temperature, atmosphere, water and other conditions suitable for life C has both rotation and revolution D is the smallest planet in the solar system
• 6. How to explain that the earth is an ordinary planet in the solar system
• 7. It shows that the earth is an ordinary planet in the solar system
• 8. Why is the earth an ordinary planet in the solar system
• 9. What are the stars, planets and satellites in the solar system?
• 10. The three basic layers of the universe () a sun, earth and moon, B galaxies, stars and planets, C galaxies, stars and solar system, D earth, moon and satellites I think it should be B, but the answer is C. is the answer wrong,
• 11. How long does it take to get from the moon to the earth at the speed of light
• 12. How long does it take to get to the moon by the fastest spaceship now RT
• 13. Do objects have the same mass on earth, moon and spaceship
• 14. How long does it take for an airplane (airliner) to arrive from the earth to the moon?
• 15. 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?
• 16. 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.)
• 17. 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?
• 18. 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
• 19. How long does it take for a man to be on a spaceship at the speed of light?
• 20. 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?