many units are used to measure length. a)which is the convenient unit to express the distance with earth from the star thiruvathira? b) define one light year?
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It’s a handy way of expressing really large distances without having to resort to scientific notation. It’s easier to say that the Alpha Centauri star system is 4.367 light-years away than it is to say it’s 4,1315×10^+13th power kilometers. They also sometimes use the unit Parsec for the same reason.
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