A light year is the distance at which light travels

A light year is the distance that light travels in a vacuum for one year,

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1. How long does it take to see an object one light year away Suppose an object is one light year away from me. How long does it take for me to see the object with a telescope and how to calculate the time? Please answer in detail. Thank you first
2. How far is the distance between the earth and Mars? How long does it take human beings to get there by spaceship? How long will it take for a human Mars probe to reach the surface of Mars?
3. How long does it take for the fastest aircraft in a light year?
4. Today, with highly developed science and technology, people still like moon culture because: This is the problem of homework
5. Why do people still like moon culture in today's advanced technology?
6. How many nanometers is an astronomical unit
7. What is an astronomical unit
8. What unit of length is 1 ' What is the unit of length if there is a prime at the top right of the number? If there is a prime at the top right of the number, what is the unit of length? It's a unit of length in clothing. Does it mean one foot or one inch?
9. What does "length" stand for in the unit of length? 1/2” high by 1” long
10. For the ruler with a length of 9cm, three scale lines are determined on the ruler, so that the ruler can measure all the whole cm line segments from 1 to 9cm at one time. Three schemes are designed
11. The distance between Altair and Vega and the earth? How far is Altair from the earth? How far is Vega from the earth? How far is Altair from vega? Are they brighter than the sun?
12. How many light years does it take for the light of the star nearest to the sun to reach the earth
13. Outside the sun, the nearest star to the earth is? 4 light years, 40 light years, more than 4 billion kilometers, more than 400 million kilometers
14. Scientists also told us that Vega is about 26 light-years away from the earth, and Altair is 16 light-years away from us
15. The known distance of a somersault is 3.4 × 10 km Ask the monkey king how many somersaults to turn to, known to turn a somersault to take a second, ask him how many years to turn to
16. Why is the position of Polaris almost the same from earth What kind of stars does Polaris belong to Doesn't Polaris move? The earth is moving
17. How many meters per second is one light year
18. How many meters is a light year? Is it the 15th power of 9.46 × 10 Or the twelfth power of 9.16 × 10
19. How many light years is the distance between Altair and vega? Altair is 16 light years and Vega is 27 light years The angle between Altair and Vega is 34 degrees.
20. The distance between Shanghai and Nanjing is about 300 km. If a highway is built and the driving speed of the car is 120 km / h, the car will run% of the time There must be a formula The distance between Shanghai and Nanjing is about 300 km. If a highway is built and the driving speed of a car is set at 120 km / h, how many hours will it take for the car to finish the highway? If the car takes 7.5 hours to arrive for some reason, what is the average speed?