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Q.

It is convenient to express the distance between stars and other celestial bodies in terms of [[1]].

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Detailed Solution

It is convenient to express the distance between stars and other celestial bodies in terms of a light year.
Many celestial objects like stars or galaxies are far from Earth, Sun and other celestial objects. Calculating their distances in the kilometres unit becomes very inconvenient. Thus a large unit is introduced to estimate vast distances. Light-year is a large unit equal to the distance light travels in one year. Hence, the large distances are expressed in light-years.

1

light-year

= 9.46 \times 1 0^{12} km

If a star is

8

light-years away from the Sun, the distance between the star and the Sun is the distance light would travel in eight years.
So, the distance between the Sun and the star

= 8 \times (9.46 \times 1 0^{12}) km

= 7.6 \times 1 0^{13} km

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