If there are any ETI in our Sol system...
... they are probably in either the Main Planetoid Belt or the Kuiper Belt.
http://www.centauri-dreams.org/?p=13
http://www.rfreitas.com/Astro/WhereAreThey1983.htm
http://www.spacedaily.com/news/seti-04c.html
http://www.setileague.org/editor/stride2.htm
Saturn's rings make a great place to utilize relatively abundant antimatter
if they use antimatter propulsion for their starships:
http://www.centauri-dreams.org/?p=674#comments
Please note: I am NOT saying there are aliens in those regions, just that it
is a possible place for them to be.
