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प्रश्न
A star is 10 light years away from the earth. Suppose it brightens up suddenly today. After how much time shall we see this change?
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उत्तर
As 1 light year is the distance covered by light in one year. So, if the star which is 10 light years away from the earth glows today, then it will be seen after 10 years.
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संबंधित प्रश्न
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