After a discussion with friends that there are no moustaches in space, a challenge was set to find a calendar of men in sci-fi movies with moustaches. The criteria for entry is hard, as there must be no other hair on the face except for the upper lip (with occasional spreading), so no goatees, soul patches, full beards, etc. (which unfortunately disqualifies some great ones, such as Ming the Merciless).
Mr January: Lando Calrissian

Mr February: Moonpie

Mr March: Blaine

Mr April: Wikus

Mr May: Zed

Mr June: Art Land

Mr July: Doctor Yueh

Mr August: Lt Coffey

Mr September: Peter Martin

Mr October: Ray Arnold

Mr November: Shepherd Book

Mr December: Prince Barin

The original theory still holds though, as only 4 of the 12 are in space. There must be something about launch or re-entry that tends to rip the 'tache off your face.