Titan moves behind Saturn’s moon Rhea.  Photographed by Cassini, 4 October 2011.
[Blog admin note: Someone tried to access my then non-existent ask page yesterday.  So I’ve decided to turn the “ask” thing on; if anyone asks or says something interesting, I’ll likely reply via the questioner’s blog.]

Titan moves behind Saturn’s moon Rhea.  Photographed by Cassini, 4 October 2011.

[Blog admin note: Someone tried to access my then non-existent ask page yesterday.  So I’ve decided to turn the “ask” thing on; if anyone asks or says something interesting, I’ll likely reply via the questioner’s blog.]