Crowded Outer Solar System
Hi Guys
Phew! The Minor Planet Centre must be kept busy with all the Trans-Neptunians and Centaurs the astronomers keep finding...
http://cfa-www.harvard.edu/iau/lists/Centaurs.html
http://cfa-www.harvard.edu/iau/lists/TNOs.html
...plus other odd-ball objects...
http://cfa-www.harvard.edu/iau/lists/Others.html
Some of these are only tiny too. There's a lot of territory out there for ETIs to hide starships in.
Adam
