How many kilometers are in a light year?

2 Answers

light year is the distance traveled by light in one year.

Explanation:

color(purple)(300,000xx 365.242 xx24 xx60 xx60300,000×365.242×24×60×60

~~color(green)(9.4607 xx 10 ^12km9.4607×1012km

Apr 10, 2016

9.46*10^12km9.461012km

Explanation:

Remember that:One light year is the distance travelled by light in one year (365.25(365.25 days)days)

And,

color(brown)(11 color(brown)(lightlight color(brown)(year~~9.46*10^15myear9.461015m

Now we need to convert Metres into Kilometres

color(purple)(1km=1000m 1km=1000m

So,

rarr11 lightlight year=(9.46*10^15)/1000kmyear=9.4610151000km

rarr=(9.46*10^15)/10^3km=9.461015103km

Remember that, if a positive exponent in the denominator goes to the numerator it becomes a negative exponent

rarr=9.46*10^15*10^(-3)km=9.461015103km

color(green)(rArr=9.46*10^12km=9.461012km

Remember * means multiplication (another way of writing xx×)