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Express 1 light year in terms of metre. ...

Express 1 light year in terms of metre. What is its order of magnitude?

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1 light year = distance travelled by
light in vacuum in one year
= `cxxt`
`=3xx10^8 m//s 365.25xx24xx60xx60s`
`= 9.46xx10^(15) metre`
`= 0.946 xx10^(16) m`
Order of magnitude of light year = 16
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