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a light year is a distance light travels in a year (where 1 year = 365.25 days). The speed of light is 3 x 10^5 km/s. Finnd the distance from the earth to the star Proxima Centauri, 4.25 light-years away, in kilometres.
 Jul 20, 2013

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 #1
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1 Light year (In kilometers) is :

[input]9.4605284 × 10^12[/input]

Multiply that by 4.25 and you'll have your answer.

[input]9.4605284*10^12*4.25[/input]

Hope it helped ya
 Jul 20, 2013
 #2
avatar+3146 
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[input]299792458[m/s]*4.25year in km[/input]
 Jul 21, 2013

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