Nothing is more Christmasy to me than the Nutcracker. OK, and Christmas pudding. Sooooo—nothing is more Christmasy than the Nutcracker and Christmas pudding—and probably eggnog. Maybe Christmas carols too. OK. Nutcracker, Christmas pudding, eggnog, carols, and Saturn's moons.
In space, nobody can see you dancing classical ballet while eating Christmas pudding dunked in eggnog while singing Xmas carols. And with nobody I really mean the Cassini spacecraft.