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Stars and the Solar System — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceStars and the Solar System2 Marks
Question
Define light year. How many kilometres make $1$ light year$?$
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Answer

Light year is the unit used to express distance between the various celestial bodies. Light year is the distance travelled by light in one year. The speed of light is $300,000\ km$ per second. For example, the Sun is nearly $150,000,000\ Km$ i.e. $150$ million Km away from the Earth. The distance of the Sun from the Earth may be said to be about $8$ light minutes. $1$ light year $= 9.46 × 1012\ Km.$

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