Sweden also uses mil for distance, which is 10^4 meters (10 km)

But did they mean “A Gees”, or “Bee Gees”?

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.

A quick search found this small page that summarizes what you said