The European Space Agency today made history by landing a spacecraft on a comet. But the celebratory image has given rise to a new question: who took this picture?

Now, there's a really good chance everyone on Twitter is "in" on the joke (i.e. please don't harass anyone), but for those who still aren't sure, the answer is decidedly less interesting than a second spacecraft, an extraterrestrial lifeform, or even a specialized selfie stick (that was my hope).

Got it? Now, on to the real mystery here — who thought it was a good idea to use the Chalkduster font? Is it a requirement that every branch of science has its own goofy font choice?