Posted by **cathey** on Tuesday, December 20, 2011 at 9:18am.

the speed of light is1.86 times 10^5 miles per second. using a year of 365 days, how far does light travel in a year?

- scientific notation -
**drwls**, Tuesday, December 20, 2011 at 9:29am
Multiply that speed by the number of seconds in a year, which is 365x24x3600 = ____

Express the result in scientific notation, _.__x10^_

The answer will be the length of a light=year, in miles.

Compare your answer with

http://www.universetoday.com/39630/light-year-in-miles/

- scientific notation -
**Dr Russ**, Tuesday, December 20, 2011 at 10:07am
Unless you have been told otherwise I would recommend that you include the units in a conversion such as this. While it might seem pedantic here, it can help a great deal when the units are less familiar.

365 d y^-1 x 24 h d^-1 x 60 min h^-1 x 60 s min^-1 = ___ s y^-1

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