How long is a light year?

Question: How long is a light year?
- Keywords:
  light,
  long,
  year
Asked by jacobconachie to Adam on 14 Mar 2011 in Categories: Space.
- Adam Tuff answered on 14 Mar 2011:
  
  A light year is the distance light travels in one year. It moves at 30,000km per second, so in one year it travels 10,000,000,000,000 kilometres…thats the same distanc as travelling around the world 25 million times!

Question: How long is a light year?