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Taking 1 ly (light year) = 9.3 xx 10^(15...

Taking 1 ly (light year) = `9.3 xx 10^(15)m` and one day = 86400 s, express the speed of light `(= 3`xx` 10^(8)ms^(-1)` as ly `(day)^(-1)`

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`2.79 xx 10^(-3) "ly" "day"^(-1)`
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