The way I was taught :
radius of earth = 6.4 x 10^3 km ~
10^4 km
radius of milky way = 4.7 x 10^17 km ~
10^17 (I trust you on the exact radius, Aeolus

)
Thus, OOM difference of about 13. B)
I critisised you, Aeolus. Now gimme your shoes (your sig

)! Hehe.
(I hope this is not deleted. Any way, I could be teaching Cran a few things about etiquette... If my post is deleted, he will know what not to say :huh: . If it isn't, I guess he'll know this much satire is permitted...

h34r: )