What do you understand by the statement that a star is 8 light years away from the Earth?

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Solution

A star is located eight light years away from the Earth. This means that the distance between the star and the Earth is equivalent to the distance travelled by light in eight years, i.e., a star is located $8 \times (9.46 \times 10^{12}) = 7.6 \times 10^{13}$ km away from the Earth.

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Tarun got to know from his elder brother that sun is the nearest star and is approximately 150 million kilometers away from the earth. He wanted to know which is the next nearest star and what is its distance from the earth. His tutor told him that the nearest star is alpha century and is at a distance of 4.3 light years from the earth. Tarun does not know what a light year is. Can you tell him?

Q. Match the columns

A	B
(1) Speed of light	(a) 4.3 light years away from earth
(2) Light year	(b) 300,000 km/s
(3) Sun	(c) Nearest star
(4) Alpha Centauri	(d) distance travelled by light in one year
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'The distance of a star from the earth is 8.33 light minutes.' What do you mean by this statement ? Express the distance in metre.

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What do you understand by the statement that a star is 8 light years away from the Earth?

A star is located eight light years away from the Earth. This means that the distance between the star and the Earth is equivalent to the distance travelled by light in eight years, i.e., a star is located 8×(9.46×1012)=7.6×1013 km away from the Earth.

A star is located eight light years away from the Earth. This means that the distance between the star and the Earth is equivalent to the distance travelled by light in eight years, i.e., a star is located $8 \times (9.46 \times 10^{12}) = 7.6 \times 10^{13}$ km away from the Earth.