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Stars and the Solar System — Science STD 8 — Question

Gujarat BoardEnglish MediumSTD 8ScienceStars and the Solar System2 Marks
Question
What do you mean by light year?
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Answer

The distances in universe are so large that 'km' becomes an extremely small unit to express such large distances. So the distances between various celestial bodies are expressed in the unit of 'light year'. Light year is the distance light can travel in one year. One light year is equal to $9.46 × 10^{12}$ kms.

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