That is a good photo, haven't had a chance today to see this one thanks.
Actually it was yesterdays one -
http://antwrp.gsfc.nasa.gov/apod/ap110120.html that spurred my thought. Noticed all the external objects around the galaxy something you dont see with normal vision. I can't imagine how many colder objects are circulating around.
I have thought about this for a while since your original thread on the trillions of earths. That was a real eye opener.