Not too sure where you got that number from. From what I can find, the radius of the observable universe is estimated to be about 46.5 billion light-years.Edit: I see now that you are talking Galaxy. That's different.
In all that is wrong with recycling to begin with, do I even need to put cardboard and paper into recycling; or does it just break down easily in all the garbage?
Sweden also uses mil for distance, which is 10^4 meters (10 km)