Re:The Size of the Human Radio-Broadcast Bubble in the Milky...
by gjm11 on Monday February 07, 2011 @05:25AM
(#2188421)
Yes, there are many definitions. None of them, however, gives the result that the Milky Way is flatter than a piece of paper. Not even the (rather silly) one used by the author of the web page you quoted; his numbers are wrong.
The milky way does not have a clear cut end, so you need some kind of definition on where to stop, and there are many ways to do so.
And you should stop estimating thickness by looking at photos. Brightness often masquerades as thickness in photos.