A star is about 400 million light-years away from the sun, equivalent to about how many kilometers

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• 1. It is about 4 light-years away from the sun, which is equivalent to about km
• 2. 1 light year = () km
• 3. It takes 4.3 light years for the light from a neighboring star to reach the earth. How many meters is it from the earth?
• 4. The speed of light is 300000 kilometers per second. A year's journey of light is called light year. How many thousands of miles is a light year?
• 5. The speed of light in vacuum is 300000 kilometers per second. How many million kilometers (365 days) is a light year
• 6. It takes 2.56 seconds to send a laser signal from the earth to the moon, which is reflected back to the earth by the moon. What is the distance between the moon and the earth? It's about physics, the propagation of light
• 7. In what way does the light from the sun travel to the surface of the earth
• 8. How many light years is the earth from the sun?
• 9. How many light years is the earth from the sun Light years! No kilometers
• 10. How many light years is the sun away from the earth? How many light-years is our planet away from the sun? Another question is always puzzling me! If the sun is 5 light-years away from our earth, then the sun will explode or disappear at this time, will we see the explosion or disappearance of the sun on our earth at this time? Or will we wait until five years later?
• 11. According to astronomer's measurement, besides the sun, our nearest star is the nearest neighbor star with 4.2 light years According to astronomer's measurement, our nearest star, except the sun, is a 4.2 light-year neighbor 1. Light year is a unit of length. How many meters is one light year equal to? 2. How many years will it take for an astronaut to leave the earth in a spaceship with a speed of 1000 meters per second? 3. What is the inspiration of the above calculation results for you to understand the universe
• 12. One light year is about a few kilometers
• 13. It is about 4 light-years away from the sun, equivalent to () km
• 14. How many kilometers is 16 light years? Please gods
• 15. The kilometer is a longer unit of length. Is that right?
• 16. Why is the rate of electric field establishment = the speed of light?
• 17. Why is the speed of electric current the speed of light? Our teacher said that there is free moving charge in the wire, so the light goes on as soon as the power is turned on, just like the water stored in the water pipe Is this a scientific statement? If this is true, the propagation time of electric current needs almost no time. But the speed of electric current is the speed of light. I checked other questions. We said that the essence of electric current is electromagnetic field, and the propagation speed of field is the speed of light What's more, is the formation of electric current really the directional movement of electric charge? Then why is the speed of electric current not the speed of electric charge movement but the speed of electric field propagation? (I know that the speed of electric charge movement is very slow, don't talk about the conclusion, I want to know the reason, ask the big God to answer, don't answer the questions that I don't know.)
• 18. Why is the conduction velocity of electric current equal to the speed of light? Why is the propagation velocity of electric field equal to the speed of light C?
• 19. The propagation speed of electromagnetic wave in vacuum is equal to the speed of light,
• 20. When the speed is equal to the speed of light, time stops; when the speed is higher than the speed of light, time reverses What does this sentence mean? Why do many scientists agree I feel that what he said is that you can also think that it is equal to the speed of light, and time stops because you are so fast that you can't see time going, But beyond the speed of light, time goes backwards, which I can't imagine why Who can explain it scientifically~