You know the photo I took the other night of Jupiter and it's moons? 
Today curiousity finally got the better of me, and I installed a rather wonderful application called "Stellarium" on my netbook, to figure out which moon was which. Rolling back the clock to about the right time-frame that we were in the back garden, the magic box of tricks tells us the following (click on the pic for a bigger version via Flickr); 
From left to right, they are Callisto, Europa, Io, and Ganymede. It also occurs to me that I should have pointed out that the pictures from the telescope are of course upside down and back to front - it's a reflector telescope!
International Year of Astronomy 2009 Retro Poster Designs
I really love this sort of retro design, with simple geometric shapes. Very similar the Serenity poster set from QMx that I have.
In the comments at the bottom the designer says that he hopes to set up an online store before Christmas - I'd love to get one of these.
UPDATE: Sorry forgot to credit @brainpicker for these
