what are light years? and how many killometres are in light years?

Question: what are light years? and how many killometres are in light years?
- Keywords:
  light year,
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Asked by anon-225887 to joannabarstow on 19 Nov 2019.
- Joanna Barstow answered on 19 Nov 2019:
  
  A light year is the distance light can travel in one year. It is about 9.5 trillion km.

Question: what are light years? and how many killometres are in light years?