OK fine and sorry, I'm just kidding about the "objects" (propeller "moonlets") spotted by Cassini halfway along the outermost A-Ring of Saturn being Alien spacecraft, but whatever they are (probably new moons in the process of formation), you have to admit they're pretty darned cool.
Click here for the Space.com article on same, and read the replies, they're pretty funny.
Here are the pics. The first one (click on photos to enlarge) reminds me of a miles long alien Boeing 747. Right, we should be so lucky (or doomed).