Why is distance between stars expressed in light-years what do you understand by the statement that a star is 8 light-years away from the earth?

If a star is located 8 light-years away from the earth, it means that the distance between the star and the earth is the distance light would travel in eight years. So, the distance between the earth and star = 8 ✕ (9.46 ✕ 1012) = 7.6 ✕ 1013 km.

Why is the distance between stars expressed in light-years Brainly?

Answer Expert Verified the distance of stars from the Earth and the distance between the stars are very large therefore we can’t express this distance in kilometre thus these large distance are expressed in another big unit called light years.

Why is the distance between a star Express?

The distance between the stars is so large that Kilometers becomes a very small unit. Hence, the distance between stars and planets are expressed in light years . One Light Year means Distance travelled by light in 1 Year.

Do light-years measure the distance between two stars?

Distance Information When we talk about the distances to the stars, we no longer use the AU, or Astronomical Unit; commonly, the light year is used. A light year is the distance light travels in one year – it is equal to 9.461 x 1012 km. Alpha Centauri A & B are roughly 4.35 light years away from us.

Why is it convenient to express the distance of stars in terms of light-year rather than in Metre or Kilometre?

Answer: Stars are millions of kilometres away from the earth. It is not convenient to express such a large distance in the units of km. So the distance of stars from the earth is expressed in time taken by light to travel in one year.

What is a light-year def?

Light-year is the distance light travels in one year. Light zips through interstellar space at 186,000 miles (300,000 kilometers) per second and 5.88 trillion miles (9.46 trillion kilometers) per year.

Why is it convenient to express the distance of stars in terms of light-year or parsec rather than in km?

The distances of astronomical objects like stars, planets etc from the earth are huge. The distance on the earth are relatively small so it can be measured in km. This number is so large that it becomes hard to write and to interpret. So astronomical units like light year, parsec A.U are used for large distances.

What unit is best for expressing the distances between stars?

1 astronomical unit
To measure the distance of a star, astronomers use a baseline of 1 astronomical unit (AU), which is the average distance between Earth and the sun, about 93 million miles (150 million kilometers). They also measure small angles in arcseconds, which are tiny fractions of a degree on the night sky.

Why do we measure some distances in astronomy in light-years and some in astronomical units?

We added a new measurement the Astronomical Unit (AU) which is based on the average distance between the Earth and the Sun. This unit is good for measuring the distances between planets. Hence the light year is a convenient and manageable unit of distance for measuring the distance between objects in space.

Which is the convenient unit to express the distance from the earth to the planets?

Answer: The parsec is the unit astronomer use professionally . the light year has long been used by astronomers when they are trying to communicate to a broad audience perhaps with mixed success. A parsec is 206 , 265 AU and is roughly the distance to the nearest distance.

What is the distance between the stars and the earth?

The nearest stars to Earth are in the Alpha Centauri triple-star system, about 4.37 light-years away. One of these stars, Proxima Centauri, is slightly closer, at 4.24 light-years. Of all the stars closer than 15 light-years, only two are spectral type G, similar to our sun: Alpha Centauri A and Tau Ceti.