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I'm a middle school student who enjoys astronomy and I volunteer at a local science center. At that science center I have no trouble answering questions about the visual aspect of astronomy, but I do run into some trouble when I am asked about the "techy" or mathmatical side of the science. Therefore, I went to the local used book store and picked up "Universe (fifth edition)" to enhance my knowledge of some of the mathmatical formulas used in astronomy. I'm having a bit of difficulty answering this question:

The speed of light is 3.00 x 10^8 m/s. How long does it take light to travel from the Sun to Earth? Give your answer in seconds, using powers-of-ten notation.

The answer is 4.99 x 10^2

As far as I can tell, I have not overlooked anything in the chapter. Here is my work and my answer (1.496 x 10^8 being the distance from the earth to the sun in meters)

Step 1- 1.496 x 10^11m = (3.00 x 10^8m/s)(t)

Step 2- 1.496 x 10^11m / 3.00 x 10^8m/s= t

Step 3- 499m/s x 10^3s = t

Step 4- 4.99 x 10^5s = t

Answer- 4.99 x 10^5s= t

What am I doing wrong here?

Forgive me if this thread is redundant, in the wrong forum, or too easy to for an answer

Thanks,

Zack

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# Homework Help: Light from Sun to Earth in seconds

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