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Posted by Kyle on Saturday, October 6, 2012 at 10:50am.

I have a hard time getting this someone help me? Astronauts often use the unit light year to express intergalactic distances. If light travels 3.00 x .10^10 cm/s and one year is defined as 365 days, how many kilometers does light travel in one year?

I would change 3.00E10 cm/s to 3.00E5 km/s first, then 3.00E5 km/s x (60 s/min) x (60 min/hr) x (24 hr/day) x (365 days/yr) = ? km/year.

9.47*10^12 km or 9.47e12 km

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