How many light years is the earth from the sun Light years! No kilometers

The distance between the sun and the earth is eight minutes and a half light years
That is 8.5 * 60 * 30 = 153 million km, 150 million km

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1. 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?
2. The speed of light in a vacuum is 3 times 10 to the eighth meter per second. How many kilometers per hour
3. The propagation speed of light in vacuum is 300 million M / s. how long does it take for light to travel 90 cm in vacuum
4. The propagation speed of light in a transparent substance is about 25 times of that in a vacuum, and the propagation distance of light in 60 seconds is about 20___ Rice
5. In 1, 2, 3, 4 Of the 1000 numbers, 999 and 1000, how many numbers can't be divisible by 2 or 3?
6. Calculate the number of numbers within 1000 that can be divided by 6 and 8
7. What are the characteristics of numbers divisible by 101
8. Characteristics of numbers divisible by 37
9. Write 12 continuous natural numbers that are all composite numbers
10. Five continuous natural numbers, each number is a composite number, the sum of these five continuous natural numbers is the smallest______ ．
11. How many light years is the earth from the sun?
12. In what way does the light from the sun travel to the surface of the earth
13. 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
14. The speed of light in vacuum is 300000 kilometers per second. How many million kilometers (365 days) is a light year
15. 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?
16. 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?
17. 1 light year = () km
18. It is about 4 light-years away from the sun, which is equivalent to about km
19. A star is about 400 million light-years away from the sun, equivalent to about how many kilometers
20. 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